Hmm, I have thee exact opposite feeling. I've been playing since beta - religiously. It was the longer TTK which kept the game more team orientated. Because battles lasted longer, you needed to work together as a unit to come out of them alive. Now with this TTK, team dynamics is pointless and doesn't require you to work as a unit to survive.
Press the button and watch your combatant die instantly. Why would you need teamwork for this? If anything I have found teammates are now competing with each other to get the kill first or steal the kill, because again... whom ever shoots first knocks first.
I can't even begin to understand your reasoning behind why you feel it promotes MORE team play?