If true we can't fight another Vietnam with the enemy operating from safe sanctuary. On thing is clear, the terrorists have switched tactics to suicide and car bombings, ala those used against Israel and other targets for years. No point in sitting there and taking it, the two main sources of trouble border Iraq. If syria and Iran are dealt with there is no other clear state backed terror regime in the region.
I doubt we could get support from any country, if we decided to invade Syria.