It seems like gaming on Mac is at its highest peak, and will probably only go up from here.. I've never seen so much gaming content on YouTube or Reddit, for example.. and I've owned a Mac since 1998.
So it seems like this is probably going to pick up more steam (unintended pun lol) than some people may think..
For what it's worth, the AetherSX2 emulator has been an amazing improvement over PCX2 for example..
PPSSPP is also running great natively on ARM code. So anyway I think the whole ARM thing will play out quite nicely for gaming on mac.. And if the right devs or contributors band together (hopefully with $$ support from the community) I don't see why an "aethersx2" type PS3 emulator won't be possible for ARM (Mac, Android, etc) ..
But of course.. only time will tell
Now, if there are some devs/ contributors out there reading this and want to shed some light on the topic that would be amazing.