Having worked in the videogame world as a PR agent for many companies that focused on reviving retro titles, I can almost certainly guarantee, the reason we don't see more releases like this, or the same ones over and over, is licensing and no one knows who owns what now.

I have spent days arguing with big companies trying to show them they do indeed own the rights to whatever obscure game and my client wants to buy those rights so they can rerelease the original and put into production remakes and such.

Google the development of Maximo by Capcom for the PS2 for a good idea of how hard it is to bring these classics back, or even use the name of one that company did in the past.

The biggest hold up to more retro titles getting re-released, remade, is money. When the owner is found, oftentimes they want Super Mario Bros levels of money for a title that sold 100 copies on Commodore Vic-20 in 1979 and nothing has been done with it sense (outside keeping the rights held up).

I now do Perler bead art based on games and try to get permission to do them legally and again, money is a concern. Most want thousands of dollars for permission to create something that is, honestly, going to sell maybe 10 to 15 units total at $8 to $20 each (not profit).