Taking a gamble is something the anime directors are too scared to do, I think if they made a gamble and made Dawn a traveling companion of Ash and Brock again it would work, but as I said earlier, there is more to making the series better than to bring those two back, the villains need development, much like what happened with Team Rocket early in BW, Team Flare and Team Rocket would make perfect rivals, they basically seek the same thing so them fighting it out and causing trouble would be really nice.
As for Dawn, if she was to come back for a full time appearance being a pokemon stylist would be great, but how will it play out in the series, don't get me wrong I like Pearlshipping, I would hate for Pearl's lustre to be lost if the handling of the series is wrongfully done. I hope for Ash and Dawn to travel again but I feel that it needs to be done right.
so here is my question for you all. If Ash and Dawn were to travel again, how would you see their adventures unfolding as the X and Y series progress?