I think you misunderstand me, I think the LGPL is a perfectly good license for Qt and I have little sympathy for those who aren't willing to abide by it (not least because Qt is a rather large library, and there's no excuse for every application to load its own copy).

> Decide to go commercial, then pay accordingly upstream.

Hmm. The commercial license actually prohibits starting development under one of the open source licenses then switching to commercial. If you start under an open source license, you'll need to abide by the LGPL if you decide to go closed source (and of course what you've already released remains open source).