Most Israelis consider these people on the fringe. Their desire to destroy the mosques on the mount would certainly trigger a war worse than any yet seen in the region, and would undoubtedly be condemned by the US and all other reasonable world governments.
-Eric
I've read quite a bit about the Temple Mount Faithful, and I don't believe that they themselves are planning to do anything to the mosque. I was under the impression that they believed G-d Himself would take appropriate action. ;-)