I think THQ Nordic has the rights to distribute PB games. That's why I don't think they will be delisted.

There are a lot of games not updated by anyone and still available for purchase.
I prefer if games (drm-free) are available in oryginal form, because people always find a way to make them playable on current system. It is more difficult to make it with a previously modified game.
It's fine when they are modified to a ready-to-use state, but as a bonus. If it can make games harder to adapt in the future or lose the original version irretrievably, I think it's a worse solution.