Time will def tell.
The answer is always "play better teams, win more games" when teams who win 7+ games are out in the cold, and there were quite a few.
Most teams can only do so much, and a down season or two from normally good OOC teams could sink your chances.
With the 12 teams making it, for D5-7 since they went to 7 divisions, 8 wins will get you in 100% of the time.
7 wins:
93% for D5.
90% for D6
98% for D7.
I hate to make a line in the sand so to speak, but a 7-3 record is what I would consider a good season for most teams. With the new format, as you can see using the numbers since 7 divisions started, there will be a number of 7 win teams who dont make it in D5-6, and likely even more in bigger divisions.
With that said, I think that disproves the argument the new system "lets everyone in" and ruins it.