The idea is that we will basically force the users to update, since their client will be broken the next time they pay attention to it.
It is surprising to me no one yet implemented some automatic alert system into cryptocoin wallets. If wallet connects to multiple nodes that report
the same higher wallet version, longer blockchain and send some invalid data then warn user to check coin website or forum thread for updated wallet.
There can be more criterias that need to be fulfilled for warning to popup (to prevent abuse) but it can be done and would help solve issues big time.
Also, Bitcoin has instant messaging system where Gavin Andresen can send messages to all nodes on network, will SXC ever get something like that?