If you don't have to split the house with siblings, people can and do live with their parents until their parents die. And then you end up in a situation that my family is in. The family house is being lived in by one member who can't afford to even pay the electric bill, let alone the taxes. And we end up trying to keep the house from being taken by paying her bills, without the a path to evict her.
As for people realizing college or vocation training is necessary for the standard of living they want to achieve. They are also too old to do it easily. And are disappointed that they will be starting at the bottom rung in their career at age 30 or 40.
We are going to let a lot of people make bad decisions in life that is going to indirectly impact our labor force decades from now. I'm not saying people should be forced to go to college or anything. But we should be making it the easiest decision of their life, and discouraging stupid behavior whenever possible.