Remember, the Inquisition had to be formed because the ruling class were more worried about trivial nonsense despite a

hole in the sky.
Divine Justinia (Cass in my playthrough) will still have our back. And I think that's better than having the Inquisition in full form and people thinking she has her loyalties split by helping us.
Plus, all the elves leave the Inquisition under mysterious circumstances
The Templars doing there own thing, now, too
The mages are now split, too
The Inquisition seems to be on the way out without the disbandment
As for Solas; I'm torn because he caused the problem and will destroy us all to fix it
He's gonna make for a great antagonist