Cans are a win-win for both the consumer and the brewery. The only downsides are the stigma associated with cans, and the expense of either replacing a bottling line, or installing a supplementary canning line. Most established craft breweries have already invested in bottling, but if I were opening a brewery today and had to choose one or the other, I'd be canning.
ETA: This is probably a regional thing too. Here in CO I'd estimate that *non-canning* breweries are in the minority. We even have a couple of can-only beer festivals. Sierra Nevada is behind the curve, although I'm happy to think about how much attention a brewery of their size will bring to cans.