Personally, I would need some concrete sign from Syria that would make me trust it. Thus far, I have seen no such sign, at least not in public. As for arming Hamas, Iran does it through the Sinai, and therefore, no agreement with Syria would have any effect on the armes and other supplies to Hamas, including the presence of Iranian Revolutionary Guards in Gaza. Arms to Hezbollah could continue to be supplied by sea, unless the Lebanese army would be willing and able to stop such shipments. The strategic value of the Golan is too great for it to be given up unless there are very good reasons for doing so. Recent actions by Syria, as proved by the strike on a yet undisclosed, but significant target, and by reports of cooperation with North Korea, do not make one confident in Syria's intentions. Of course, decisions regarding Syria can only be made by Israeli leaders, hopefully in consultation with their military strategists.
from the article: Washington: There is no place yet for Syria in peace process