Comparing D1 March Madness to CFP is comparing apples to oranges, too, though. The NCAA obviously does not control the CFP tournament. I don't know what it would take for the NCAA to assert control over the FBS postseason, or if it even could, but the fact of the matter is that unless and until the NCAA does obtain that control, the institutions and individual leagues are free to associate with, play against and create a tournament for whomever they want (Edit: I wasn't previously aware that a 1984 Supreme Court decision has lead to this result.).That's comparing apples to oranges. There are different levels for a reason. We don't let Winona State into the D1 March Madness, because they are not a D1 school. They have their own tournament to play for the championship.
There is no official split between P5 and G5 conferences (or P4/G6 whatever). If that happens, fine. Then the G6 conferences can have their own national championship tournament. But as of now, all ten conferences fall under the designation of FBS football. They all have the same rules, same number of scholarships etc. Therefore, every team should have a chance on paper to win a natty.
That's how it works in every other level of college sports.
What's to prevent the G6 or the NCAA from creating a tournament for the G6? If the B1G/SEC and to a lesser extent, the Big 12 and ACC want to control access to the tournament, I view the prerogative no different than the individual conferences determining their own membership and who is eligible to play in the conference championship game. Toledo is an FBS football school. Why can't it play in the B1G championship game? I don't think anyone on this forum would suggest that Toledo belongs in the B1G or that it should be entitled to play in the B1G championship game. If the G5/G6 schools are feeling left out, the simple solution is to create their own tournament.
I do think that the P2/P4 would have less of an issue with automatic births if it weren't for so many schools moving to FBS that frankly have no place in the subdivision. Virtually the entire CUSA, and good chunks of the MAC, new MWC, and Sun Belt ought to be relegated to FCS. If the G5/G6 were instead two conferences comprised of the best AAC/MWC/PAC and a handful of other teams, its probably an easier sell to the power conferences to divide the pie. The indignant article probably should be headlined "Quit Telling Half of CFB they belong in FBS."