Is the least they could do maybe treble xp 
Chiming in here with another vote for perma-double-XP. Really, what could it hurt now? Leveling any alts and fleshing them out that much faster will add to our enjoyment of them while we still can do so.
M. Bison: For you, the day Bison graced your village was the most important day of your life. But for me...it was Tuesday.
-- Street Fighter (1994)
McClane: Hey, thanks for saving my daughter's life.
Farrell: What was I going to do?
McClane: That's what makes you "that guy."
-- Live Free or Die Hard (2007)
from now until the end. Perma DXP so we can level up those alts we never got around to playing + kick off all th erandom invasions (Rikti, zombies, halloween doors) and zone events to fire off randomly so everyone gets to have a blast on the way out.