Well. Sad news indeed. I certainly don't want to see the lights go out...but if they have to...why not go out with a bang. I suggest that if its the end of the world...you might as well treat it like that. Do an event to end all events. Turn on every invasion in every zone all at once! Rularuu, Rikti, Zombies, Snowmen, Nemesis and anything else I am not thinking of. Add a End of the World badge for killing 1000 of each to separate the men from the boys.
Just a humble suggestion from someone who has been here a long long time.
Thanks for all the good times. Sorry to see you go.