I see no evidence that the decline in enrollment is due entirely or, even primarily, to the rise in costs. Perhaps students are FINALLY learning that not everyone "has " to go to college. Of course the people actually doing the learning may be their parents.
The good news is that for the last several years (3rd now?) For-Profit enrollment is down while traditional enrollment is up slightly.
I would expect this would have a slight impact on rising costs as well as For-Profits tend to charge more (4x as a community college and 19% more than non-profit public university).
Potentially also softening the increase in costs I know Michigan and a few other states have increased college funding for the first time in quite a while as well
