Kinda hard to tell since every fanbase is doing it. That's the problem though - too many people just jump ship when the person becomes overly successful.
I don't think any of those jumped on the bandwagon
It's just there has been a lot of praise for her lately from almost everyone due to her recent success.
EDIT: So basically Monsters won in the other Which fanbase is the most insecure of Taylor's success and now they're winning as the fanbse who has been bandwagonning the most for Taylor?
Individuals from each fan base. However, I do feel like I've noticed more Madonna fans showing a bit support lately (although that may just be due to the fact that there's less of them, so it's more noticeable). And, of course, I'm glad to have any of M's fans on our side.