Certainly there are a lot of dialogues and conversations taking place involving the government of Afghanistan as well as various insurgent groups, including the Taliban, now.
Regarding the training and the substitution of Afghan national forces for ISAF or NATO, there are a couple of points worth making. First of all, ramping up the Afghan national security forces into the hundreds of thousands is never going to be a sustainable proposition within the Afghan economy and the Afghan government's ability to generate funds to support it. So it is always going to be an outside-supported effort.
Second, if you don't have the broader peace framework and the national stabilization through conversation and negotiation—which admittedly is very tough to do—then you can have 300,000, 400,000, or 500,000 Afghan national forces and you will still be stuck with this civil war situation that will still need to be resolved.