What happens to “Syria” doesn’t matter.
What matters is the formation of the new nation along the Euphrates in former Syria and formet Iraq.
I’d be all for an independent Kurdistan making up parts of what’s now northern Iraq, northern Syria, and southern Turkey. Kurds seem to gravitate towards a more secular and less fundamentalist interpretation of Islam than Arabs, and would be a good counterweight to Islamists in the region. However, I’m not convinced that it’s the job of our military to help carve out that independent Kurdistan for them.