Some people want fake meat to be a 1:1 meat substitute because they love meat but can't eat it (allergies, cardiovascular, etc). Some people want cheaper meat because quality meat you can trust has grown too expensive. Some people want more vegan/vegetarian options because they object to killing animals or economic externalities that cattle grazing causes. Some people want meat-based substitutes because the companies are public and they are looking for the next unicorn to invest in.
The problem is, those looking for meat substitute think it isn't close enough, those who want cheaper meat think it's too expensive, vegans/vegetarians have actually vegetable based options and aren't necessarily looking for fake meat at all, and investors fell for hype.
Every one of these entities has a different metric, and several of them are at odds with each other. In my opinion, if plant-based meat turns out to be a flop, it will be because its core market is too many different groups and it'll never satiate all of them.
Case in point - read the comments on this article. Everyone has a different reason for wanting or not wanting this stuff.