No other goods or services have been prohibited in the past, and consolidation has been widespread anyway. I don't think prohibition had anything to do with it.
Between 1930 and 1980, draft sales decreased linearly from 70% to 12%. If everyone started buying beer in cans or bottles, companies with the most capital would be best positioned to dominate the market, through better margins, better QC, bigger distribution networks, and more volume. Selling beer in-house, on draft, is more profitable for small breweries, but selling beer in cans in huge volume is more profitable for big breweries.
I blame refrigerators for destroying the craft beer industry in the first place.