My concern with this pattern is two fold:
the more 'craft' breweries the big guys have in their tent the easier it is for them to control the market. Right now new breweries have a chance to get a spot, however small, on store shelves because the market want's an alternative and until recently the big guys have not had one to offer. They do have money and resources though. if they can not only give lots of cool free stuff but can also fill those 'alternative' spots on the shelves it becomes increasingly difficult for a new guy on the scene to make a mark.
second, When you are a company as large as AB/Inbev you MUST cut costs in order to increase profits. and you MUST increase profits (note to less careful readers, I'm talking about INCREASEING profits not simply MAKING profits) There are two ways to cut costs, cut labor costs or cut materials costs. given that Budweiser has dropped from ~17 IBU in the 1970's to ~6 today you can see where they chose to cut costs.
the idea that you can't run a business and be obsessively concerned with quality is just false. Look at Russian river. But you can't run a multinational mega brand commodity business like AB/Inbev and be obsessively concerned with quality.
I'm sure that these small breweries are told that the quality will remain the most important thing and nothing will be done to change their creations. But once the contract is signed, the check cashed, that beer will have to meet quarterly profit expectations. if that means using 5% less hops because focus groups say they don't notice a difference then that's what's going to happen, this year, and next year again, and the year after that, and so on and so on. it's the death by a thousand cuts.
I don't care that these breweries are selling out. Because I think that the small sector of the market that made craft brewing what it is, the customers that want something new, amazing, interesting, and quality will continue to look for that. so these buy outs are just opening up a spot for the next Vinnie Cilurzo, or John Kimmich, or Patrick Rue, or whoever is ready to make that next shining star.
I DO WORRY about these buyouts because it could be used as another tool to manipulate the 'free' market in a way that will make it harder for the next Cilurzo, Kimmich, or Rue to even get on the shelf. However, I am hopeful that there are enough smart business people running bottle shops and tap rooms to give the new guys a chance.