From my own personal perspective, I'm OK with it. If a brewery owner has poured their blood, sweat and tears into their business, they should be allowed to recoup on that. As many bigger players start snapping up smaller breweries, that will only serve to increase access to those craft brands. Goose Island IPA is all over the place since the AB buyout. If the beer is good, then I'll drink it. If it sucks, I won't.
But I can certainly see the cause for concern by the little guys. Not every craft beer drinker is as discerning as me. A good friend of mine likes good beer, but his fridge is always stocked with Sam Adams and Sierra Nevada. I fell like most beer drinkers are the same way - who has the biggest display, best packaging, most familiar name, etc.