Agreed - As someone who enjoys the taste and the effort being made, Impossible burgers still feel very much like a novelty. There are several restaurants in my area serving Impossible burgers, but they are usually the most expensive burger on the menu. Given that this is going to be a dollar more than a standard whopper, it'll cost the same as a double whopper.
With that, the only real incentive to eat the impossible whopper over the standard whopper would be personal motivation to eat less meat. And I'll hazard a guess that most people eating Burger King aren't immediately concerned with cutting down their meat consumption.
Agreed as well. I find this encouraging given beef's large carbon footprint, and think low-grade burgers are the best target for replacement by synthetics (forget trying to engineer a steak). I don't expect them to become popular until they're almost indistinguishable and at least as cheap, but I think that could happen soon.
With that, the only real incentive to eat the impossible whopper over the standard whopper would be personal motivation to eat less meat. And I'll hazard a guess that most people eating Burger King aren't immediately concerned with cutting down their meat consumption.