I think HTS taking Syria is lesser evil for Israel.If the U.S.-Israeli side thinks they can hug HTS now (in order to sideline Assad first), to squeeze them later with the help of YPG, by a media onslaught of suddenly remembering HTS' past, I'm not that sure that plan is going to work.
Past year Israel was fighting the entire Shia axis:
* Hamas, although are Sunnis, openly joined the Shia axis (they were getting weapons from Iran, money, their leaders constantly visited Iran).
* Hezbollah, which launched tens of thousands rockets at northern Israel.
* Houthis, which imposed naval blockade on Eilat port and launched drones and ballistic missiles.
* Iraqi Shia militias which lunched drones against Israel.
* Iran itself which armed and financed all of them and also directly attacked Israel twice with ballistic missiles.
The weakening of Hezbollah in 1 year war with Israel was one of main reasons of current rebel success.
If rebels take Syria Hezbollah will be isolated and will never restore back to its power. Will rebels attack Israel after liberating Syria? I doubt. Golan heights is good buffer zone. Attacking Israel with short range rockets from Syria is useless. Long range rockets can be detected and destroyed and I doubt that anyone will give them such rockets. Plus I dont think that anyone in Syria is interested in war now.