I don't know if the Uber Channeler really cares so much about his town in this case.....I mean, does anybody know if the game is a 'lose last town and your channeler dies' kind of game?
From what I've read, I wouldn't assume losing your last town would end the game (although settings for that kind of thing are a must).
Even still, from all Brad's talk about being able to hoard essence to create an uber channeler, I still get the impression that the intention is to have said channeler at the head of a (small) army, not as the army. And I'm sure having at least one city will confer major advantages over being homeless. So if all my assumptions and impressions are anywhere close to being right, I imagine a lone, homeless channeler to be relatively easy pickings.
But I guess we don't really know much at all for certain. We could discuss this for pages and pages, but it'd probably be more productive to wait for alpha or beta to see how things are before trying to figure out the right balance.