i've just thought on this after reading about the infinite dragonflight again in another topic.
first we killed malygos (because he turned mad).
second we kill deathwing (soon in cataclysm).
now... will we also kill the other 3? and maybe then sargeras/burning legion will again try to take over azeroth?
i'm pretty sure we'l fight nozdormu (leader of the infinite dragonflight) aswell. and ysera could be a possible fight after becoming corrupted by the never-ending battle with the emerald nightmare? dunno why we'd kill alexstrasza unless she's mad about the death of the others though.
oh those are also possible expansions
70-80 malygos
80-85 deathwing
85-90 nozdormu
90-95 ysera
95-100 alexstrasza? sargeras?
post your thoughts