The Ivies haven't really changed anything in regard to scholarships. The story has been, for more than 50 years, that student-athletes are generally given an advantage in the admissions process (i.e., their potential contributions to the school as athletes weigh heavily) but not in financial aid -- all aid is need-based and fully meets need. It can't be taken away because you get hurt, or the new coach doesn't want you, or whatever (which was BTW true of athletic scholarships until about 1967); nor, for that matter, if your grades are low. No over-signing or partial scholarships or any of that stuff. In a sense, it's simply a matter of need-based versus merit aid. (The military academies follow a third course -- they pay everyone.)

What has happened is that the NCAA cap on athletic scholarships has in effect dropped their value well below that of a full-boat "academic" scholarship. There's controversy with NCAA D1 now about raising the cap -- looks like that won't happen (after initial approval) because of opposition from less affluent programs. (Many observers believe that raising the dollar limit was a ploy be big-money schools/conferences to split the division once again.) But for the time being, anyway, a student-athlete who qualifies for need-based aid, which is most of them, gets a better deal financially (and probably academically) by going Ivy.