Well barella, that's going to depend on how many miles you fly, and how they're divided between which carriers. But it would easily be possible in F, and should be possible in C if you plan it properly!
BlondeBomber I am sure that it will just be 38K to requalify (as this is how the old system worked), although I can't recall having read this anywhere. In terms of the *G Comparison Chart, a full membership guide is due out in "mid May" (although things seem to be running a little behind at BD at the moment...).