Other than Pets, (which has its detractors due to restraints) I have heard nothing but negative things when Universal attempts to create classic style dark rides.
I think Cat in the Hat is a perfect example of this, a ride that's just as good, (if not better,) than many Disney style classic Fantasyland rides, yet people crap on it non-stop.
Madagascar boat ride in Singapore seems to be exactly what everyone claims they want Universal to do, yet I hear it referred to as a failure all the time on forums and social media.
And don't even get me started on how fast everyone turned on Universal once Yoshi was open, a ride type that everyone around here has seemingly been begging for for decades. Or Mario Kart, which is far more dark ride than anyone seems to want to admit for some reason
MiB thankfully has its fans.
I don't think Universal is giving up on dark rides... As
@Legacy said, they just may not want to do Pets, and it'll be a few years before something else gets designed. I bet you anything we get a new dark ride of some sort in KidZone, but that's still going to be after Epic Universe.
Universal hasn't given up on classic dark rides, so much as they hardly ever build them to begin with.