Its weird, before R/T I wasn't so into the big fan ships either. And its still the only pairing I really write or read. I don't really worry about trio ships, though I do think R/Hr is likely to happen. Actually, I'm not that interested in the trio - I guess I sort of feel I write fanfic to cover territory JKR might not. I'll read the occasional trio fic, though, and I have written a few one shots.