Form a plan for killing off client versions which assume they'll live forever
From at least 0.2.4 to 0.2.6, tor client versions assume that they will keep on using the network forever. They have no "request to stop" code or other mechanisms that prevent them becoming a drain on the network.
It would help to plan their transition out at some point, so we can work out what to do to make version obsolescence in future.
See #15233 (moved) for killing off 0.2.2 and 0.2.3