Everything becomes retro one day. Just have to wait for this generation to grow up and get income and chase their past like every generation does.
For a certain amount of time until the disc rot hits, yes. But even psx and saturn games still work if taken care of. So not a huge concern.
Bigger concern is honestly the longevity of the consoles themselves. Ps3 and 360s are pretty much universally shit at some point, where still plenty of psx and saturns kicking.
Also emulators and digital versions basically making the hard copies not worth a damn.