I don't see so many things actually becoming overused. Many new pokes show some capabilities of sticking into that rank, however, counting on the improvement of some of the old ones (the powerful poke from last gen: Salamance, Blissey, Snorlax, Metagross, Tryanitar, Skarmory, and the others) I don't see too many things getting in. I can see some of them like Kaburaisu
Goukazaru (have my doubts as it is an improvement on Blaziken but Blaiken was killed very often last gen), Lucario, Manaphy, Kureseria, Darkrai (if not banned), Jibacoil, Dosaidon and Agunomuu. Other than that I don't see too many pokes fitting in the overused, maybe Kabarudon but I'm not sure either.