New hardware will always happen, i still own a bunch of 290's from back in 2014, they're still running rock solid.
But i get the point. What could and would be interesting in this story is perhaps the fact that these mx gpu's might be replacable by new gen mx cards. But i'm not very sure about that though. Would be ideal!
This is where a PC is more modular and cost savings come into play if the cards are NOT upgradable. Perhaps the manufacturers could comment on the ability to upgrade the cards.