As much as I would love to see AoS return to something more closely resembling WHFB, my gut feeling is that we won't see that happening. I think between GW being "all in" on AoS this year (supposedly this year is going to see more AoS releases that 40k, if rumors are to be believed) and the number of players that they hemorrhaged over to other gaming system when they blew up the old world, I think a more likely scenario would be for them to just kill of AoS / WHFB than try and rebrand it a 3rd time, or maybe hand it over to the specialist studio? That is assuming that AoS is doing worse than WHFB. That seems to be the case locally, but I've heard AoS has been better received in the Uk than in the US (source: I don't know, I think I heard it on a podcast).
Sorry, a lot of "I think" or "I heard," but just my impressions.