I think there is more to it than that, though...
I don't think something like Rolling Rock being priced low is going to affect craft. I suspect that's a way to get macro drinkers to remember that Rolling Rock exists and goose the brand relative to other macro.
But I think macro-craft, i.e. all the breweries/brands that the macros are acquiring, could cause a price war. Especially as the popularity of breweries wanes from the peak. I think right now we're still in the "golden" era of a craft beer boom (whether you call it "bubble" or not is up to you), and I'm not sure that it's going to remain hip to be visiting breweries at the level they need us to in order to remain afloat.
If the popularity does wane a bit, and the "crafty" brands use their market power to try to gain market share, they're going to do it partially with pricing. I already see it. Goose, Lagunitas, Golden Road, Founders, etc are attacking the market through things like packaging [more than just 6-packs, like the 15-packs, offering both can/bottles side by side, which leaves less shelf space for craft, etc], and by trying to hit price points that craft isn't trying to hit. At the same time, Constellation is trying to maintain Ballast's "super-premium" pricing strategy--one of the reasons they acquired Ballast in the first place, so at least there is one that is avoiding that price war.
So yeah, I don't think OP's example is an effort of a price war aimed at craft. But I can see the big breweries using pricing as part of a multi-layered strategy to crowd craft off of store shelves and tap handles.