Yeah, I know my topic title sounds like something for a new book. But I digress (lol)!.
OT: If Alextrasza does end up being corrupted and unsavable (which I highly doubt she wont be). We're going to end up having no flights to protect us. Malygos is dead, Deathwing is going to be, imo there is no chance of saving him. If we couldn't save Malygos (although we didn't really try to), theres no chance in hell we're going to save Deathwing.
The Bronze Dragonflight lead by Nozdormu is soon going to fall I believe. We are revealed that the infinite dragons leader is Nozdormu, and Noz knows what his fate is and he can't change it. I think as the time draws near, which for the sake of the warcraft story will be soon, we will eventually have to fight him or something that involves him betraying us because of his insanity caused by him knowing how he will die/be corrupted. If we do end up killing Alextrasza because deathwing corrupts her then she'll be gone.
We all know that Ysera is the younger sister of Alexstrasza, she is going to be in cataclysm helping fight against Ragnaros to save the world tree and Hyjal. We may also see her taking the role of dragonqueen if Alexstrasza is corrupted. This may set her up for a larger role in future expansions. We all know how much blizzard likes for major lore characters who are seemingly good to become corrupt, Arthas anyone? I have a feeling somthing like this might happen in cataclysm or a future expansion.
We've had a larger involvment than before with the dragon aspects in wotlk. We've grown dependent on them for protection and help in a way when needed. The wrathgate would have been an even bigger disaster than it already was if it wasn't for the dragons. I think at some point we won't have any dragon aspects/flight to help us in a time of need, and we'll have new leaders of some ancient race to take on the role of the aspects. Like... the elemental lords become allies. I know its a complete BS idea. But with how each aspect 1 by one is falling and information is coming out that there are attempts to corrupt the remaining ones we'll have problems without them.