Right now, he's working with Teheran cause it's easy for him. I do think that if he thinks its in his best interest, he'll roll, but I doubt if he will do it by himself...and Iran is acting like there's no way they are ready. There's not enough oomph in the Shiite world to make this happen yet.
Now if the Sunnis come aboard, that would be a different kettle of fish. But Jordan's not interested, Egypt is laying low for the most part, and Saudi doesn't want to go there as of this morning.
There are radical groups in all of those countries, though, who wouldn't mind it a bit. If, like was suggested today, that this is a campaign against the greater Islam, something might change, but I don't think the Arab leaders themselves are buying that one.
Staying on high alert in Syria helps take people's minds off their miseries and focus them on a perceived enemy, so Assad has nothing to lose by doing that. In fact, its probably handy for him.
IMHO, of course.
Your opinion, perhaps, but it makes perfect sense.