I didn't care much for Secret Bases, but it might be neat if they received a revamp in OR/AS to make them more dynamic in my opinion.
I forget how advanced the villa was in Pt, I don't know how much more dynamic that was compared to secret bases, they were sort of the same thing,
But I definitely think secret bases are coming back much bigger and better perhaps with multiplayer esque features? I don't know how it would work but it sounds cool.