Per-thread performance tends to matter much more than number of cores for the enthusiast market, which has centered around the 6700K (which I've got in my own machine right now). The 6700K retails for $330 and is about 14% faster per-thread than the 6900K, which I'm betting is a tougher proposition for AMD to manage.
This chip definitely seems rad, don't get me wrong--I just think the enthusiast market is sensitive to what this isn't, at present, doing.