This is yet another example of why p2p is the future. No one should rely on PayPal (use Bitcoin), Twitter (use Twister), Facebook or any of the other big companies when you can avoid it. You are at their mercy and under their thumb from the start.
It's a bit premature to draw the conclusion that the end of the big companies is near. I agree that p2p-networking is the (or at least a desirable) future, however people will only use p2p if it's really easy to do so.
The volume increase at BTCTurk could be the result of people seeking an alternative to PayPal, but it could as well simply be due to the recent rise in BTC price or the result of speculative buying on the presumption that Bitcoin might see increased adoption after the decision. However if PayPal ceased operations in Turkey, it's also possible that BTCTurk might cease operations if the government pressures it to do so.
Although a volume of $2,7 million is nice, it is certainly just a tiny fraction of the PayPal processing volume in the country. But it's a start...
ya.ya.yo!