The idea will be enough.
I strongly doubt it, why would she start another war on westeros unless she has good reason, after Aatapor, mereen, volantis(whch will be a bloodbath) she would not want to inflict that on "her" people. I can see her being drawn in by Aegon fighting For him only to find out his fakery. Or against him only to have it left that yes, it's possible he was real.
Just the idea he's fake, with no proof, a possible marriage, a possible healing of the realm, and an impending attack by the others, why would she bring fire and blood without proof?
Edited by The Dragon has three heads, 25 January 2013 - 10:43 PM.