Tiny -- Just to reiterate what Paul said ... A few years ago, when I (I'll not speak for Peggy or Paul on this particular issue...) got very frustrated with UBB, we started some research on possible alternatives. What I determined for myself was that other BB platforms had advantages over UBB but they also had some drawbacks, too. Bottom line for me was that there wasn't a truly great BB platform out there so we've just stuck with UBB and made it work.
Like Paul said, a transition to an alternate BB platform, especially without being able to migrate legacy content, is simply out of the question at this point. I've come to terms with UBB and we're making it work.