A separate page/tab sounds like a good idea. Something to switch over to during match downtime. You could throw an ad up on that page, too. I just wouldn't want to refresh my stream page and have to reconnect to the live feed, you know?
edit: I'm actually looking forward to some fun, trollish questions. Which is why I think live updating on the main stream page would be sweet as an end-game. Stuff like, "is he going to drop these lightning loops?" during a combo or "is Vergil broken?" after a blowup.
Update: I've just gotten the code that will allow for refreshes of the polling in-page to work without having to refresh the page. You'll have to refresh when there are new polls, but for new results, I have you covered.
In the future I'll see about getting new polls added to the page without refreshes, but that's a longer-term undertaking.