A lot of good, and thought-provoking, comments above.
Dommers, yeah, I wonder how much the England in and out isn't helping him in this role. If he was a no for England, then I think he has a different approach and would be a good, consistent choice.
wEV, sadly won't be wearing the rose so could step up and take the mantle. Only consideration being that he is the one that get's pinged when the ref decides he doesn't like the breakdown but if he's the captain, does allow him to have the dialogue and may well change the ref's mind.
What I like about Baxter in this regard is his personality and dry sense of humour. He won't be as big a wind up as Joe and will paint better pictures. I think he's already highly thought of in the squad so could be a good captain in about 2-3 years once he's got the scars.
I think the multiple leaders is sometimes unhelpful, too many voices and you would still have that one leader. The aforementioned Farrell, as an example, I can't see anyone else in the 'leadership group' telling him he's wrong. Be a leader by doing your job well and be that example.