Hezbollah are backers of and some of the main fighters for the regime and the regime has to go - as
butchersapron said a few posts back, there can't be peace until it's gone (and there wasn't peace even before Assad made this a war). So I wouldn't put them on an equal footing with the FSA in that sense, they have a different significance. My comment on the FSA was in the context of Aleppo - if the regime is defeated there I would rather that the JaF (JFS etc) had a rival for dominance, and that might give whatever survives of the councils and the ability to resist of ordinary Syrians some breathing space.
I'll just type out a quote from Robin Yassin-Kassab & Leila Al-Shami's very good book Burning Country which I'm reading at the moment (I saw it recommended on this thread and it's well worth picking up if you haven't already):
I'm only a spectator, not living through it and having to make decisions over who to work with, what to prioritise and how to survive, so for myself I don't feel like I can just throw my hands up and say well there's no good outcome now while there's people there still working and fighting for one.