I prefer Hawke to Warden and Inquisitor to Hawke. But I'm weird and adored DA2. A lot.
My problem with disbanding the Inquisition is...what would our inquisitor do? Go back to being a regular guy? Not ever.
And as far as the inquisition going dark, I think they would only allow that if your inquisitor left or they gave you the option to make it that way by being a dick.
My Lavellan would be doing magical research, so I don't know if that qualifies as regular guy, but not leading armies for sure. And hella sure not involving herself in Orlesian politics any second longer than she has to.
I feel like in these discussions the same way when people said the dovahkiin would have to become emperor, which to me means boring paper-stamper. If I'm going to do anything, it's going to be affecting the metaphysical realm. Other people can have the council meetings and frilly cakes.
As for Hawke, I hated the lack of agency and the sense you could do basic competent things like even try to stop Anders before the Chantry went boom. Hawke being snarky, which really was the only palatable option, became really unpalatable as she continually just stood by with her thumb up her hoohoo while the city fell apart around her. I didn't really want to play a human becoming a noble, either. Pfeh. At least Hawke is subdued and her failings are acknowledged in DAI. That made me hate the character less.