Granted, guidance counselors and advisers are sometimes of varying and questionable skill levels. It's not a job that has good performance benchmarks, and someone who is just a nice person can get by in such a position.
I would also absolutely like to see some alternatives to the university system, there are certainly lots of flaws and poor separation of concerns that result in a lot of detractors from effective education.
That being said:
Your wife should look through job postings for the field she intends to change to, see what skills and degrees they require or prefer. It may be she doesn't even need a new degree, but if she does she'll know what degree. Focus on the getting the "requireds", then start applying, and while applying/looking build skills in the "preferreds". It doesn't hurt to try and get in touch with someone in the field as well, and get their advice on what her next steps should be. Any of that will be orders of magnitude better information than what an advisor can give you.
Advisers are there to guide you through the bureaucracy of the university, let you know when/if you need to fill out this or that. Generally you should already have looked into course prerequs/requirements for your degree when you walk in their office. They will double check make sure your not skipping an important course that might not be offered for a couple semesters.
Have you ever had to help someone pick something out, like a new car, when they don't know what kind of car they want. It works out about the same way. "So what colors do you like? Ok that's a start, how about this one, do you like it? No? Ok this one? Ok this one? Do you like the big ones or the little ones? Sporty ones or do you want something big enough for a family?"
They are not trying to PUSH you into the system, you just are too stupid to come prepared with some basic research and life decisions in hand, and so they have to do exactly the same thing. Baby steps of "Well do you like art, or this or that?" That's not there job, they just do it because so many people are too stupid to realize they shouldn't make life decisions within a span of 15 minutes. They'd probably like to really so "HEY IDIOT! You need to do some serious research and consideration on this before you proceed." but if they did that then students would throw their hands up and complain about how the adviser didn't help them at all and they still don't have a major or courses registered blah blah blah.
If you come unprepared, then you've put them in the awkward position to try and "guide" your idiocy into anything they can get your drooling mouth to bite on to. They aren't going to have knowledge of literally hundreds of different fields. Do you have any idea the number of subfields there are within engineering alone?
Now you want them to sit there and look up job posting/candidate ratios, average salaries for the places you hope to live, etc. for all the possibilities? Right a couple hundred of them on cards and let you shuffle them and pull one out?
1) As for them pushing people into "a system", you walked into their office, which means you've probably already applied and been accepted to "the system". You were the facilitator to the participation in the system. If you are referring to jobs requiring a degree, that is not the educational industry driving that. The driving force there is it is one of the few benchmarks employers have to measure candidates. As ill prepared many degrees leave you, there is still a base body of knowledge that an employer will expect you to have if you have a degree in a certain field. Any degree at all indicates your commitment to completing something and following that process to completion.
Until something else comes along that becomes as well recognized as an accredited university, it will remain a recognized way to cull candidates.
2) Choosing a couple core courses to satisfy a humanities requirements, vs. choosing a for your degree major are two completely different things. I took music theory for my humanities requirements because I enjoyed it, but I degree is in computer science. I get your point though. Some people come in without knowing what major they want, and go with whatever without much thought, see #3
3) Would you choose a path that will affect the rest of your life based on a 15-30 minute meeting with someone who barely knows you? Anyone who doesn't do some research on their own is going to pay the price for making a major decision without major consideration. Should we blame the university for people who plow headstrong into something just because they don't know what they want to do with their life? If anything, the university should as a nicety say "HEY STOP! You need to take some time to look into this and what this decision means to your future." but I don't see how they are obligated to make your life decisions for you.
"are taking the advice of so-called "professionals" which are close ties to the for-profit education system."
Again you're trying to equate the advice of an advisor, to some sort of motivation of the university to increase revenue, and therefore are pressuring you into attending. Once again, if you're getting advice on class/degree choices and are in an advisor's office, you've probably already decided you're attending. The advisor isn't there to convince you to attend, and I've not seen anything you've described being such. The only way they might increase revenue is to push you into a specialty program like a health care program that has higher tuition rates than the standard courses.
There's a lot more factors outside of the university system that pressure people to attend.