I distinctly remember when Qdoba started phasing out the Impossible. My local one held onto it a bit longer and was one of the later locations to lose it.

I like Impossible, but it’s a hard sell for many because it was the most expensive of the regular protein options. I say “regular” because they sometimes had limited-time specials that were more expensive. Chipotle took a better path with the sofritas because it is its own thing rather than a fake meat, and it is the lowest tier of pricing. From my own observation, it is at least somewhat popular with meat-eaters, but only a vegetarian/vegan is likely to get Impossible due to the higher price.