The CFP should see great numbers this year. There will actually be more viewers, because the average fan will care more about the CFP with a total of 12 teams now. We are getting closer to a "March Madness" in football. With all of the legalized gambling now, it will make more people care about those games too.
As far as the non CFP bowls, the average fan could care less about those games. The best players on those teams will all be skipping those games (Colorado might be the only exception), so only fans of the schools will care, even some of them won't even care.
I am sure several bowls will go away when the CFP expands in the future.