I'd expect a pretty positive reaction from the community as a whole if they switched their focus to 3v3. When I looked at the poll results for "Poll: Which format should Gameriot use for its first ever WOW arena tournament?" on
Gameriot (home of a lot of popular arena blogs) earlier today and saw 3v3: 64.3%, 5v5: 35.7% Total Votes: 2318, I was a little surprised. I suppose it makes sense though. There have been other unofficial tournaments based on 3v3 as well from what I remember (I don't follow it that closely though).