4 conferences simply won't work for an infinite pot of reasons starting with geography

Say you want to get to 4 mega conferences, you need each conference to carry 16-20 teams. How on earth will you achieve that?

P10 adds TT, tu, OU, Okie St
B10 adds Iowa St, KSU, KU, ND
SEC adds Miami, FSU, CU, + GT
ACC adds Lewisville, Cincy, UConn, + SUNJ
(B12 most likely to implode because it touches 3 conf, if you want to get rid of ACC - we'd slide to B10/SEC and then B12 gets more BE leftovers)

Aside from the absurdity of B10 ading Iowa St + KSU (and ACC's additions), you now get to fill in the rest of the schools (TCU, WVU, and whatever midmajors/BE schools you want). You'll end up with a lot of these conferences adding schools they have nothing in common with aside from a football team.

Keep the conferences as they sit today. If you want the playoff to happen, make it a *REAL* playoff... top 16 BCS teams get it. Rewrite bylaws to include practice/gms in Jan and you're done. Oh, and pay the players so the farce that has become "student athletes" at big time university programmes can finally be stopped.