Aftermarket, I'm not sure what the factory is doing, but most all of the important parts will be available.
Sears (factory replacement, reduced travel, and gunsmith fit), sear spring, trigger return spring, mag releases, pins, recoil springs, magazine springs, and guide rods are all available aftermarket. SA sells OEM the mag spring and slide stop.
So, besides the striker, I'm not sure why folks are fretting about parts. Barstock trigger bars might be available shorty also, so there are few parts you can't fix.
I've shot lots of rounds through a couple of mine and only had the striker retension pins break. I've done enough guns to see other stuff go too, but no more than other stock guns.