BC and Wake will not be part of a power conference in 10 years.
The Big Ten and SEC are likely to add 8 (four each) out of this pool of 11:
UNC, UVA, VT, Clemson, FSU, Miami, Notre Dame, Oregon, Washington, Stanford, NCState.
The three not chosen above plus Louisville, GT, Pittsburgh, Duke, AZ, ASU, and Utah will create 10 marketable teams that will want to be in the Big 12. As of today, we have 7 spots for those 10.
That will leave three of the above plus Cal, Washington State, Oregon State, Wake Forest, Syracuse, BC, on the sidelines.
Basically trimming the 69 teams in the P5 as of this fall (68+ ND) into 60.
It's not impossible that the best of those squeeze their way in if a conference pushes past 20 (say, to 21 with three divisions of 7 teams or 24 with four divisions of 6 teams) in which case they would be re-absorbed but I don't see that being the next step as it would require an exponentially improved TV deal to justify and some of those do not cut it.