If something like this would be implemented, I would suggest a more generic feature for loading different plugin setups. To solve this iLok specifik issue, I would suggest that Pace make a nice fix instead. Maybe just let the iLok system to notify you only once..
But here's another possible use case: I work mostly with mastering but sometimes I like to do some mixing, so I got tons of mixing plugins which I would never use in a mastering context. I really wouldn't mind to be able to configure which plugin selection I would like to load when I boot Studio One, so I could work with my mastering without seeing all those other plugins. I can almost solve that by hiding plugins, but I also like to hide for example all UAD plugins I never want to use without having to remove them for each update, so I would like to keep that function for that only.
Years ago I solved this with a third party Audio Unit organiser application, which moved the Audio Units between different folders for different setups. Very handy. Actually, I would probably prefer to use an application like that with support for both VST, VST3 and AU instead of having all of that built in to Studio One.