Luckily, Future fusion was limited to one, so the TCG will never face its full wrath as the Ocg did. However, what will most likely happen is that stein/chimera hybrids will pop up everywhere. That in fact could overrun the game. Chimera will still be insanely powerful, as I've seen the decks that will be used with it.
I have friends that play the ocg a lot, and its an insanely quick deck and it was a good move on the part of UDE to move the banlist to Sept 1st so we wouldnt have to put up with a full month of pure chimera. However, with the comming format it could easily be just as bad, albiet slowed down by a turn or two