The tragedy is terrible. And the next invasion will be Iran. And Galloway says: Iran will regret, now isolated, not having helped Syria. Now there is no Syrian state, and terrorists are in power, with all the consequences that imply to have a terrorist as a leader of the country.
Nothing is ever as good or as bad as it seems.
Short version
The jolani dude will not be the leader of Syria, he'll be the "interim defense minister" or something like that. Syria will likely be divided into autonomous regions, with a Sunni area in the center, Turkish controlled areas along the N. border, some kind of Kurdish area in the north east, Druze in the south and probably an alawite area covering the Russian air and naval bases on the coast, which Russia will keep. At least, that's what would naturally form if things follow a peaceful course.
The surprising speed with which the whole Syrian system collapsed is pretty clear evidence that there was a plan by Assad, under Russian direction, to cede authority to different groups in the near future. They were probably waiting for Trump to flesh out the precise details.
The Israelis and CIA knew of that plan and acted to pre-empt it so as to configure the new Syria more to their liking.
Slightly longer version:
All of this is part of the broader Russia/China-led maneuvers towards a multi-polar world. Over the last 10 years, Russia has been engaged in concerted diplomatic efforts to re-shape the Middle East away from being a disjointed mishmash of oil-rich states that it has invaded, bombed or occupied (politically or militarily or both) and those that had stubbornly resisted (not many) US domination. With Israel operating as the US' main garrison of course. And towards an integrated ME that itself is integrated into Eurasia.
Apart from all of the other moves towards a MP world, consider that in the last 18 months :
China negotiates an agreement between Saudi Arabia and Iran to re-establish diplomatic relations and reopen their embassies within two months. Described by analysts as
‘a broader sign of a changing global order’
Syria (as a result of intense Russian diplomacy) is welcomed back into the Arab league.
Assad closes the Houthi embassy in Damascus and opens a Saudi embassy
It seems pretty clear to me that there already was a Russian plan for Assad to cede power to the "legitimate opposition" in Syria as part of the normalisation process of inter-state relations in the ME. This would, of course, include Israel, but the Israelis being super paranoid and distrustful of everyone were not inclined to be eventually forced to the negotiating table in a real way (finally!) with their Arab neighbors over the Palestine issue, and in general in a less dominant position.
So being aware of these plans, both Israel and the 'anglo-American establishment' decided to pre-empt them. They started with the false flag operation of Oct 7th that allowed for the destruction of Gaza making the Palestinian question a moot point. They knew this would allow for the attack on Hizb-allah and they also planned to do what they have done this week: pre-empt the Russian-led plan for Assad to cede power peacefully, and steal the initiative and have their people (HTS) be the "liberators of Damascus" and therefore be in a better position to shape the new authorities in the new Syria. Which will likely be a series of autonomous regions.
By the way, Assad and family have been in Moscow since late Nov.