I'm honestly surprised more people aren't talking about this... Apple is doing it(getting into higher end gaming) right now, it's happening right before us with their recent moves including what we've seen with these new MBPs, and a lot of people haven't seemed to realize it yet.
One of the biggest reasons games have not been ported to the Mac over the years has been market share. The market share of the Mac and the demographics of the users, doesn't make it worthwhile to port a lot of games for a lot of game companies.
Enter M1, it can run applications meant for iPhone and iPad... there's a level of compatibility between the two platforms, because they're now the same CPU architecture, that does not even come close to existing between popular traditional computers and smart phone/tablets elsewhere... devices which make up a very very large market. All 3 combined, comprise a user base of over a billion people worldwide. That's a fat market, one in which the users have consistently shown a strong willingness to pay for games and applications.
Suddenly, porting to the Mac isn't about going after the dollars of a couple of 10s of millions of mac users, many of which are business/creativity focused, but rather, porting to Apple Silicon is about going after the dollars of hundreds of millions(well over a billion last I looked it up) of users, many of which are gamers.
The next couple of years will bear this out... while not every game will make it to the Mac(not every game makes it to every gaming platform), many game companies who would have avoided a Mac port in the past, will absolutely do an Apple Silicon port, because otherwise they'll be leaving a lot of money on the table and the shareholders/board of directors will be none too happy about that.