I've seen the Clintons at their work (wielding power) since their time in Arkansas. Do not count them out.
BHO will give them nothing he does not have to. Which is diddly-squat as of today. He will give them the brush-off, even at political cost.
Thing is, I doubt BHO will do very well. HRC will be there to reap the benefit of his mis-steps. I fully expect a primary challenge in 2012 and a much more successful one than Teddy ran vs Carter in 1980. They also will not be surprised by his use of the race card in 2012, like they were in 2008. They'll play it early and more effectively than BHO, as they are fast learners, smarter than BHO, and more ruthless.
No, despite my antipathy toward the Clintons, I expect them to be around for a while.