PC's fine I guess, but I hope this doesn't come to Xbox/Nintendo.
These particular games are so integral to PS' history that it'd be a terrible look for the brand if they were playable on competitor consoles. Same reason I'd prefer not to see Gears come to PlayStation (back when Epic owned the rights & that was totally possible).
Why even hope that? It does nothing to the "brand"
It makes a ton of business sense in the first place. How many PS1 era players that loved crash remain on Ps4, and how many are on other platforms now? If Sony are not willing to pay a high enough price for full exclusivity, then Activision will obviously take advantage of other platforms or other forms of exclusivity (timed console / timed only). I don't know what engine is being used either. If it is something like ue4 or unity, porting to different platforms is something more trivial