This is a pretty big setback for Yale in terms of refocusing more on STEM. But they're in good company. I'm sure 10-15 years ago music company executives were similarly pissed off.
I think that, in considering their options, "Yale's stance on a fly-by-night improvement to the course catalog" has a very low weight, and will be forgotten by next admissions season.
Because Yale has options too - if a few students decide to make a principled stand, there are others waiting in line just as good who care slightly less.