With this rationale, I propose that the next version of Twisted (most likely 17.3) will be the last to support Python 3.3. The question of Python 3.4 support is something that will need further discussion (where 3.3 just plain has the writing on the wall), but I believe a removal of support not long after is reasonable, considering the 3.4 installed base is smaller than that of 2.6.