[quote=GreivousKhan]
In summary, the Empire needs just a few miracles. :p I mean even with the first two phases, an invasion of Summer set is no small challenge. Close to a herculean effort when I think about it, since it took the Brass God(Numundium) to invade Summerset the one and only time anyone has ever succeeded in the task. 
[/quote]

I think it can be managed, the Thalmor appear to be facing a rapid decline, if Phase one plays out they would be close to collapse, and as you pointed out the elves live a thousand years, I am sure some are against the Thalmor and even those which aren't may be having doubts about the strength of their leaders. Such a rapid decline would certainly impact morale. I don't think it needs miracles so much as it need to get the other races to think ending the Thalmor would be useful. Once the Dominion is pushed back to Summerset and their navy lies in tatters, the elves might well be demoralised. It will require time, but if the other races gain a foothold and keep it held, maybe they can coerce the Thalmor into a surrender. If not, we take their key positions and leave them for dead

If it took the Numundium the first time, lets go one higher and beat them without it the second time. The Thalmor are tough, but from everything we've seen they aren't invincible. A united army of Redguards, Nords, Bretons, Khajiit, Bosmer and Imperials should hopefully be enough to topple the Thalmor, if not we'll ask the Dark Elves too, they are powerful mages.