It would be cool to reproduce some of the older games as accurately and artfully as possible using new technology while also adding a handful of clever upgrades.
For example, my custom Flipper Fair backglass has a TILT illumination on both elephants and no "previous high score" window... but you'd never have noticed otherwise. I like stealthy upgrades. Like installing LED's in places which look better than bulbs. (Comet's twin 2835 SMD frosted warm white is my default go-to for general backglass illumination)
I can imagine new production versions of games like Space Mission with some sampled Apollo mission chatter and vintage beeps and such. Done right, it would be a true "classic plus", but it is difficult to build upon the past in a way which honors the original essence while adding new features that don't disrupt the balance of the game itself.
Can it be done? You betcha! But, even if the technical and design challenges are overcome, doing it with an acceptable profit margin while staying on the right side of copyright law isn't likely. Retro Pinball's KOD machine was a good example of that... heart in the right place... but not quite able to hit enough bulls eyes to sustain the project.