Comanglia
I highly highly doubt turkey would just simply be dropped as a NATO member. Given Turkey's central location it's an extremely important area that the USA / NATO risked getting involved with back in the early 1950s.
Plus Turkey has already played their Hand, basically if conflict is going to happen it's all up to how Russia wants to react, which as Tommunist pointed out before it'll likely be mostly talking and posturing.
You really think Obama is going to be dragged into a conflict with Russia by a rabid Erdogan? I really don't think he's going to have any of it.