Making the opposition to his rule a black or white choice between Assad's police state on one hand or AQ/ISIS on the other was a key imperative of the regime - but its a fact that opposition towards Assad far extended far aside those narrow choices at the start of this whole affair. Of course, there is no credible alternative now, but thats exactly how the regime wanted it. Their survival was also a result of their international backers having far more skin in the game ( Russia, Iran, Hezb and IRGC militias).
In any case, the final outcome is a disaster for Syria and Syrian people. I expect the genocidal police state to even become more North Korea like in its latest incarnation. He's already setting the terrain for a greater cult of personality constructed around his family - the future rulers of Syria Its only a matter of time before their brutal suppression of the majority of the country will lead to another war.
Arguably the takfiris had already taken over the revolution by 2012, with groups like Liwa al-Islam (later known as Jaysh al-Islam, the biggest and most powerful rebel group in Damascus) and Ahrar al-Sham having been established in late 2011, and with al-Nusra coming in in 2012
Also something to note that the original leaders of Ahrar al-Sham and Zahran Alloush all knew each other from Sednaya and the Gulf states HEAVILY pressured the government to release them, especially Alloush You can say all the things about the Ba'ath doing this and that to make things like this but the rebel sponsors had their hands on it as well. Alloush's links to Saudi Arabia before the war are well-known by now and he even studied in a Saudi university, thus he would've made for a very nice pro-Saudi puppet.
Too bad he just couldn't resist talking about cleansing the rafidah (Shias) and gassing the Kurds like Saddam did in interviews
As for the rest of your post, I agree. However things have always been like this, Assad isn't really doing anything different from his predecessors. This horserace shyt was in place in the 90s and earlier as well, with some dude who beat Bassel (Bashar's now deceased brother) in a horse race getting locked up for 20 years because he dared to do it. Again, I don't think that the Ba'ath is good, nor do I think the government's eventual victory will lead to longterm stability. I just think that they're better than the rebels who would look to slaughter around 30% of Syria's total population if they could.