Is there life after Sir Alex Ferguson for Manchester United?

Jaap StamSAF has been at the helm for so long, I can't really imagine United without him. We had a terrible experience with Quereioz(did I get the spelling right?) and we can't really afford a similar slip with the current state of affairs in the Premier League. So, who do you thinks should get the job, provided SAF does not do a u-turn on his decision?