Basically, my thought has always been that Egwene's White Tower plotline was in many ways a side-show. Enormously important for her character to grow and reach a level of maturity that when she took a major leadership role (right behind Rand's, I'd argue) in the LB, it would fit. But for all that, the Tower plotline was clearly not the end of her contribution to the story.

For one thing, her musing that cleaning up the Tower was like focusing on one tile of the floor before moving to the grander stage of the world was pretty clear foreshadowing.

For another, she is clearly not a "normal" Aes Sedai with more OP strength and political power than the others. Like Elayne, Nynaeve and Aviendha, she has a bigger role to play, and almost definitely a larger one than these women. I think there are four central issues of the story where she'll be an important player:

1) The long foreshadowed reinduction of the male Aes Sedai into the White Tower. This is obviously going to involve Rand, Egwene and Logain.

2) The Seanchan: her own dreams and thoughts on them foreshadow a major role she has to play in resolving the Seanchan issue.

3) The AIel-Tinker-Aes Sedai issue: We already saw the beginnings of this in ToM, and when Need took her to a Tinker camp in tGS, I became convinced she'll have a role with them too.

4) Tel'aran'rhiod and the Last Battle: TAR has been a sort of wildcard, but the amount of action that occurred there in ToM and the amount of time Brandon spent building up Egwene and Perrin's growing strength there makes it clear we're soon see a lot more fireworks there. Be it Cyndane or the Black Tower Egwene's role in TAR is pretty well foreshadowed.

So Egwene having a substantial role in aMoL is encouraging to me, since it indicates she probably will be involved in all these things.