Remains to be seen what the disposition of the new boss really is. Could be same as the old boss.
If you're referring to the rebel leader...
He's a former Al Qaeda member (who even led his own Qaeda affiliate cell).
He left and cut all ties with the group, but that's not necessarily a guarantee that he abandoned all of their principles, it could've simply been a power struggle deal.
Per a PBS article, his previously stated ambitions were:
topple Assad, seize Damascus and set up an Islamic state in Syria under sharia law.
And when asked about it, in his own words:
ABU MOHAMMAD AL-JOLANI:
[Speaking Arabic] We’re calling for what we believe in. No one should object to this, especially since Islamic sharia is filled with justice and with humane solutions for society. It’s based on a just and righteous message.
Yes...
humane solutions like physically abusing women because if a man cheats on his own wife with them, it must because she "tempted him" in some way by showing a little too much hair or ankle skin.
Assad was much more secular, but was clearly power hungry and authoritarian in other ways.
This could very well be another one of those "trading a more secular authoritarian with a religious authoritarian" situation that's happened numerous times in the Arab world.
It's unfortunate, but the Arab world (more so than any other region) has been faced with this "no-win" situation far too often.
Economic oppression vs. Religious oppression.
To use an American-version analogy.
Imagine you're currently under the rule of President Jeff Bezos (he's consolidated power, and is running the country the way he currently runs Amazon), and the group seeking to overthrow him is led by Rebel Leader Jerry Falwell...
For a substantial portion of the population, they're simply trading one form of oppressive leadership for another. The only people who would feel they benefit from that change of power would be the religious zealots.