Debate is not always a bad thing. I am on the fence, but see both arguments. I think big brew and craft brew are separate markets, and this merger wouldn't really affect craft brew in a negative way. If ABI dominated cheap, crush the can when you're done brew, and were able to drive the price up it would send customers toward craft brews. If Craft brewing prices would stay the same, people would be willing to pay the extra cost for quality beer, and the price gap between the two would shrink as ABI increased prices.
Certainly bad for other macro-brew companies, but possibly good to the booming craft breweries popping up all over America.
This is just one feasible outcome among many, which is why i find this so interesting.