7. It's far-fetched to suggest that Assad will use chemical weapons internally.
I can see some of the Jihadis who grab power if he falls using them against us, however. The implications of that risk analysis tells me it's probably better not to let the Syrian Army fall apart, as happened in Libya. Since the Syrian Army command is all based in the Alawite clans, with the Assad clan at the head, getting rid of this particular figurehead won't make any difference at all.