The only things Video Games had to offer were being "plug and play" and how being proprietary technology made them more protected against piracy.
Take all that out and Video Games are no longer interesting for most 3rd party developers. Where they will go if these "features" no longer pay off ?
To Android or to Steam.
edit: To prove my point, take some La Mulana:
(find the MSX computer LOGO on the picture ...)