Taliban making a comeback...?

[Taktiq]

I recently finished Jawbreaker by Gary Bernsten and have previously read First In, both about the CIA's teams in Afghanistan. The authors mentioned quite often how the Afghans (NA and Taliban) would routinly switch sides when they felt it was in their best interests. I'm sure we've all seen the news reports stating how the Taliban have trying to make a comeback.

I wonder, do you guys who have spent time in-country there feel that the habit of people shifting alleigances is affecting this (the Taliban resurgence) significantly? In other words, do you feel the ones who surrendered or defected and came over to fight with the NA have just jumped the fence again allowing these guys to begin making a comeback?