Is Alabama getting left out a net negative or positive for CFB?

Positive.

The SEC will blow up the current system then and maybe we get something better.

You know the answer

There are a bunch of other SEC teams in the field and at the end of the day you'd be among them if you had just beaten FSU. Nobody is burning anything down

Bama is a legacy, traditional power and I think CFB is more interesting from a national perspective when they are good.

But CFB is perfectly healthy on its own and will survive just fine in any given year(s) without Bama as a playoff participant.

Doesn’t matter as much without Saban.

Deboer isn’t interesting on his own

I think everyone will be ok