From a nutritional standpoint, I agree that it would be unfortunate if people replaced healthy foods in their diet with the impossible burger. But I think part of your position is predicated on the idea that real meat (specifically ground beef in this case) is healthier. I don't think it's clear yet whether or not that's the case.
Would you be willing to elaborate on the culture change point? Do you think that too few people are concerned about animal welfare to choose the impossible burger over ground beef even if it's competitive price-wise?