Well, if we don't call it BletchMAME, what do we call it? I couldn't think of a better name.
I will say that not everything about Qt is an improvement. It does feel a bit more heavyweight, my executable is now double the size, and the UI feels (from a Windows user's perspective) slightly more "foreign" for lack of a better world. However, it is become clear to me that Qt has far more momentum. Plus, BletchMAME seems to be much more portable in practice now.