If I can get a burger that tastes just like a regular meat burger, but didn't require a cow to die, that's a win in my book, and I'll even happily pay a small premium for that. So there's the ethical perspective of it.
In the long term, plant-based meat substitutes should be cheaper to produce than actual meat, and if you can get a burger that tastes just like a regular meat burger, but is cheaper, that's also a win. Burger King already features the Impossible Whopper, but at a premium. If that becomes cheaper than a regular meat Whopper, a lot of people, and a lot of other fast food chains will follow. So that's the economical perspective of it.
