While I personally think education for the sake of learning is valuable, the real challenge is getting mainstream HR departments to acknowledge the worth of the system. It's not often that you see an entry level job description list qualifications like this:
1. A 3 years technical experience in a related field, or
2. A B.S. within the field, or
3. A self directed series of (possibly free) online courses which requires us to perform a detailed analysis of your coursework and somehow compute its equivalence to a couple of capital letters from a more traditional education background and then rank you accordingly with every other applicant
It may fly for tech start-ups and direct hires which bypass HR screening, but most resumes still go through HR and if they can't figure out which check box to tic... or worse, if they think you're making up some fly by night claims, the application will never make it to the technical people involved with hiring. Until open learning manages to make a substantial dent on the traditional models for education, it will still be seen as third rate to a few capital letters after ones name. I think that's extremely unfortunate, but I suspect that's the way it will be for a while yet. I applaud the efforts of Future Learn and their partners for one more option. But you're certainly right about needing to maintain quality and an image of quality with the associated courses - and not diluting that for mere "market share".
I dream of the day when anyone from the sub Saharan or Alaskan wilds to the neighborhood barista can complete a standardized set of courses (with automated assignments and exams) and simply claim their degree. To offer master levels with the same thing for graduate courses and a thesis stamped with approval by a certain number of others in the field, and a Ph.D. up for grabs to anyone with the master's coursework and a collection of peer reviewed journal articles.