Over the recent past, here's what Nielsen data has said about the volume growth rate of the craft-beer segment. The raw measures may be imperfect, but chances are the trend they chronicle is quite real.
(Data sources linked)
2014 12-month ...................................................... .....+20%
2015 12-month as of June 20th........................ ...........+10.2%
2015 year-to-date as of December................................+8.7%
2015 4-week as of December 19th................................+4.3%
The gut response from many craft loyalists to what they see as threatening news of this kind is immature: Question the data, deride anyone who mentions it, and look for examples of fast-growing craft brands as if they weren't included in the Nielsen data. In other words: disbelief, nastiness, or off-point argument. Pretty childish.
For children, change can be a scary thing.
For adults, it can spell opportunity.