If they do it'll likely be part of an industry wide push to kill off the home-built PC market. It's no secret that MS and others want the kind of ecosystem Apple has and governments want more backdoor access to tech. And which mfg wouldn't want to eliminate partial upgrades/repairs. Imagine that the only PC you could buy one day has everything tightly integrated with no user serviceable or replaceable parts without a…
You're not thinking big enough. Their ultimate goal is gaming (or any computing really) available only in the cloud.
The ecosystem isn't closed. TSMC doesn't exist in a vacuum. They may be the most advanced, however, there are a few reasons this will never work:
1) older fabs can be built in a garage by a smart person (it's been done a few times, I'd link the articles, but I don't have them handy)
2) Indie devs exist and often provide better gaming experience than AAA developers.
3) Old hardware/consoles exist, and will continue to exist for many decades to come (my Atari 2600 still works, as an example, and it it is older than I)
Sure, they MAY attempt to grab the market in this way. The attempt will backfire. Companies will go under, including possibly team green if they actually do exit the gaming market (because let's be real, at least in the U.S. a full blown depression is coming. When? No idea. However, yes, it's coming unless folks vote out the garbage.), and the player that doesn't give in, or possibly a chinese player that has yet to enter the market, will take over.