The Hive has plans to fully support SCII when it is released. We have a forum for it for a reason.
Every major warcraft 3 fansite will either convert or die out. The only hope for WC3 is that the new SCUMEdit will suck, so everyone will continue to mod WC3. But I doubt it.
Once we get nearer to the SCII launch, we'll hear more about this.