If that's the motivation, it's pretty misguided, since it is a completely different motivation to buy. I buy (or pirate if I can't) the old games for nostalgia fun, not so much for the gameplay or graphics. I then also buy the new game for the modern experience & gameplay.

They want to have the option to resell you the exact same game emulated on the new systems too, see Wii Virtual Console I think it was called, and NES classic system, all of those.

People getting ROMs to play on another device doesn't stop them from doing that any more than the original systems and game carts stop them.