Getting most of those games on Steam literally gives you the ROMs. DRM free and usable in any emulator.
It's likely that at least for the Sega Genesis games Sega will throw out a new collection. The current one is pretty old and has issues, especially with latency.
It's likely that at least for the Sega Genesis games Sega will throw out a new collection. The current one is pretty old and has issues, especially with latency.