I was just thinking about this recently... and I think that the more RE's there are, the more this will become a problem, with everyone having different compressors and reverbs and not wanting to have to buy redundant devices that they've already trialed just to be able to collab on tracks properly.
Reason's centralized plugin approach is a unique advantage that should let the Props solve this issue in a way that no other DAW can, making Reason even more attractive. (And I should add, I *am* willing to chuck $5 or so at them every time I want to collab on a track with someone who has RE's I don't.)
If they can make it so that "rented" RE's are locked into specific songs that could help detract people from gaming the system. Maybe some kind of centralized collab system? That seems suspiciously like something they would be working on as we speak...