There are no guarantees though. Microsoft is interested right now, and they are also fortunate because their history is all on PC-like hardware. It’s “easy” for them to do this. For Nintendo and Sony the games were built on proprietary machines. It’s not trivial to make their stuff available.
Because of that it costs more money, a lot more, because if you do it, then people expect perfection. If you manage that, then people want it free or near free. “Why can’t I just put in the disc?” is a question you all know the answer to here. It’s not that simple, but it is easier for the company who started their gaming division with basically a PC, which is close to what today’s consoles are.
Sony hasn’t said they’re shutting down the downloads and you can still redownload on Wii many years later, but it all will end one day, for all of them. I’m sure of that. It’s the nature of tech.
This is why buying physical will always be the sole option for actual preservation, but now that consoles are PCs we have the patching problem making many physical discs obsolete too. It all reeks of the future, where everything is a service and you own nothing. Your kids will love it! The rest of us die miserable and set them up for the future with our collections sold at auction.