Well, I'd hope he'd be dictatorial "for the animals," as it were, so it would be a benign dictatorship. I think he's pricklier than Paul McCartney. Voicing support for the ALF, the controversial outbursts from stage (Norway, sub-species), making the comparison to pedophilia—McCartney wouldn't do these things. He'll always be "the cute Beatle" to some extent. Morrissey is more leonine in temperament, and weirder. And that's good.
It's true that limiting one's self strictly to vegetarian collaborators might be difficult, but with someone of Morrissey's talent, I think some potential collaborators would be willing to make the lifestyle change for the opportunity. He did get the Smiths to follow his lead in public.