This is an interesting question that honestly requires a crystal ball to predict. The boards in the remakes are obviously newer, but when they break no matter how much you shout "hey, you are only 3 years old, you should not have broken!" it won't make them start working again. What is going against the remakes is that the boards aren't quite as repairable as the old ones (although I know MMR and AFMR both have thru-hole mounts on the transistors at least). In the end it will depend on how many remakes are made as that will determine the future market for parts availability.

Case in point, they made about 3000 of the original MM games. And there are lots of part available for it. In fairness Chicago Gaming is probably closing in on that number as far as remakes. But what helps the original is all the other titles made during that era that share the same boards and components. So today someone can make or stock WPC driver boards and sell them to the owner of all the games from that generation. Hopefully at least the boards going into the remakes will interchange with each title as that will help, if they are all game specific I would be fearful of keeping one running long term. But that is me, ymmv of course.

I have a 66 year old pickup truck that is still running with the original power train. Not because it is better than a 2017 truck, it's just simpler. In a hundred years it's possible it may still be around and running, I doubt there will be many 66 year old 2017 pickups on the road. Stuff today is throwaway, it is not meant to last.

I'm not speaking to your fine remake pinball machine, but you did start the cargument...