This is spot on. (I'm a long time vegetarian, so I've thought a lot about this.) Hunting, fishing, and even specialty slaughterhouses will likely continue. The economics will cause mass meat production to go out of business, though. Beef first, probably. Engineering can evolve much faster than cows and chickens and fish can.

No politician, at least in the U.S. mainstream, is going to commit political self-destruction by going after farmers and making animal meat illegal. What will likely happen though is once the big restaurant chains and grocery stores start selling lab-grown meat that is better quality and cheaper than animal meat, the market for cheap animal meat will dry up. We'll have politicians trying to "save beef jobs" just like they are trying to save coal jobs today, due to more efficient and environmentally-friendly alternatives taking over the market. But unlike coal, consumers can still choose animal meat (you can't exactly choose your power plant), so it might be a long transition due to that market demand. Expect the Arby's and ilk to continue to tout how they use "real meat" with hypermasculine advertising for a long time to come.