A lot of Mac games now use Cider/Wine/etc. to essentially mimic portions of Windows. That’ll go away, as ARM Windows games basically aren’t a thing.
So yeah, could be a big blow to games.
They can buy a PS5 for a 1/3rd of the price of a 2080Ti and an expensive PC rig.
Mac ARM with access to the iOS sphere ie the same architecture does matter. Or will. With Marzipan and Apple Arcade it will open the floodgate to iPad games.
As for triple AAA games. They'll have to port to Metal to have access to the $$$ 'i' platform and app store.
'Mac' games have a better future under Mac ARM than the poxy 2nd rate degredation of the Open GL middleware ports with half the performance of the PC windows counterparts.
Mac devs who turn up will actually 'want' to be there on this under the 'new' Mac 'gaming' future. Not throwing us crumbs.
Azrael.