I am not an MIT researcher however my university dropped Elsevier at some point and I think generally the experience and sentiment is similar across universities and fields from the admittedly small sample size I have.

It makes things more annoying on some levels, but between the two sides of university library versus Elsevier the large majority of scientists agree with Elsevier being wrong so the annoyance is generally acceptable. Ideally this entire system changes for the better but we can make it work in the short term. Not to mention that even before this we often ran into journals we didn't have access to, so some of these annoyances would have existed regardless.

My university similarly dropped its Elsevier contract a couple of years ago. Have not noticed at all.

This is the first time I've thought about it since the original announcement.

I wonder what I missed? I guess researchers will get to use the communications pages of Elsevier journals to make fun of MIT without anyone noticing!

More seriously, I do wonder what scholarship by researchers who choose to publish there that I missed. Oh well, too expensive to find out...

It's fine. Haven't really noticed.