Dynamic resizing is the obvious compromise between the camps. Everyone can get what they claim to want from it, without having to compromise either.

If the market chooses bigger blocks, then the market can test whether or not that works out in practice. If yes, then Gavin's design solution actually was the best idea after all. If not, then the market retreating will cause the blocksize to retreat also (which wouldn't be possible under BIP100).

The market could even try out bigger blocks, decide it doesn't work, try the alternative, dislike that more than bigger blocks, and then revert to some compromoise blocksize. Y'know, it's almost as if the free market works better than central planning...