There aren't really any breakout stars that I can think off, from the top of my hand, aside from Ziggler. There are others, but I don't think they are Mania ready. I don't think it is a terrible idea for the WWE to give the Rumble win to an established star this year(Orton -- the original plan called for Punk to win it, and he was established too) As of late, the WWE has been giving lots of younger stars a chance to shine, we have seen plenty of newer stars get their chance over recent years(Swagger, Sheamus, Barret, Danielson etc.), they usually don't pan out when they are rushed. They get their push and usually they fade out. The best chance is to take it slow and steady and there are plenty of opportunities around(since basically all the older stars have retired), thus it makes sense to push the established stars -- to maintain the ratings/sales etc.