The worst part of the rumors I've seen is that over time certain armies will be phased out and if that's true then many are going to have a conniption. Like Lizardmen. But then again the rumors could be seriously off base, so who knows.
If Fantasy changes to be less about mass troops and instead focus in fewer models and more Nagash/Glottkin type stuff...then I really won't know what to think. These rumors are still pretty far out so it's hard to tell.
My biggest gripe with GW over this is one that I've had with them for a long time now - they completely fail at managing player expectations. I mean, they don't even try. It's one thing to try to keep model releases secret to drive sales or whatever the fuck, it's another thing entirely to leave your playerbase absolutely clueless as to your long-term plans for years on end. And don't get me wrong, I don't think that businesses should make their internal plans and machinations public across the board, but there are times when you need to get out in front of damaging rumors and allay the fears that your playerbase has. Why would I risk buying into a Fantasy army right now if there are rumors that armies might get squatted or that Lizardmen are going to be "bubbled"? At best, a ton of people are adopting a wait-and-see posture (AKA"I aint buying SHIT!") with a few of the worst reactions being the usual"fuck this, I quit". Fortunately for GW it's early yet, but if GW doesn't dispel some of the rumors all I can imagine is a lot of people holding off on any purchases whatsoever...and considering that the rumored timeline for some armies possibly vanishing w/o further support might be after 9th (?)...well, that's just a stupidly long time for players to be in the dark.