I'd say the main reasons for being vegetarian include not wanting to contribute to raising animals just to slaughter them, or eating other "living" beings and objecting to the conditions in which they are raised before they are slaughtered.
Paying extra for the Impossible brand name is mainly for those wanting to switch from meat yet still yearning for the texture/taste of meat. A brand like Impossible foods ensuring consistency across restaurants would contribute to people choosing to switch from meat knowing they are getting a product they have had (and enjoyed?) before.
I agree with this and the rest of your comment. You said it better than I did at the top level. There's something about food imitating food that puts me off, as is there with seeing branding on items at restaurants; but, I don't have problem going an entire week without eating meat in the first place. These products have a target audience and a good mission, but they're not for me (well, I'd get them in the grocery store when available because I like having a frozen veggie burger option at home for when I'm too lazy to cook).