If they keep him close to the racing, and keep Todt, Braun, and Byrne around, I can see them still being competitive with Raikkonen and Massa for a couple of years.
That might be the problem. There's been a rumor that Ross is taking the next year off and with Michael gone (in the racing sense) he might not come back. Todt says he's made his decision but we have to wait until the end of the season when they traditionally announce their organization for the next season. I hope Michael staying on will keep the other 2 around. I think Kimi will do well at Ferrari and Massa will be even better next year.