So much of short-term adoption of these is tied to marketing and time, but their long-term success strikes me as a foregone conclusion.
In marketing, they will need to get past a latent psychological hurdle and in time, waiting for the crotchety older folks who insist, no matter what, on a "real burger." Both things are related to the living generations who have grown up with "real burgers."
https://www.theguardian.com/business/2019/apr/02/burger-king...
I must have high burger standards. One of the reasons I don't cook them often is all the work it takes to make sure they turn out well. Right thickness, right meat, narrow temperature range, cast iron... most home made burgers, including backyard grilled, are so dry & bland you can't eat them without lots of ketchup/mustard/BBQ.
I'm allergic to legumes though, so will continue to consume fish, eggs and meat.