Sigh-Fi

Will one or the other? I doubt it. While burgers are the easiest of the fast food to prepare at home, I don't see the burger places going anywhere.

Between the two of them? The original subject of Demolition Man was Taco Bell, but test audiences said that not everywhere had Taco Bell, so they swapped the joke to Pizza Hut in some markets. Honestly it should have been KFC (the other Yum Brands company) for Japan because they love KFC over there, especially on Christmas.

The idea of "the cheapest* fast food place takes over and now every restaurant is Taco Bell" was mildly amusing, but the more you thought about it, the less sense it made. And by cheapest I mean Taco Bell was the cheapest fast food place in the 90s when that movie came out. Their food was generally cheaper and generally more filling. And you could get more of it for less. But did anybody ever seriously think Taco Bell would put burger places out of business? Not very likely.