I have a hunch that the Impossible Burger, if it's as good as people claim, will make lab grown meat hardly worth pursuing.
But the NYT notes that the company is having trouble convincing the FDA that it should declare the key magic ingredient - it's blood tasting soy leghemoglobin - safe to consume. Which is odd, given that they can sell the burger without that endorsement.
It wouldn't stop me from trying it.
By the way, one of the best fake meat things I tried in the last couple of years were some type of frozen nugget made from shiitake mushrooms. They went very well in a butter chicken sauce, and had the firmer texture that is often missing from soy based fake meat (or Quorn, which is too expensive and also too soft). They were from an Asian supermarket, but I haven't seen them there again. I can't even remember where they were made. Anyway, it's a pity, because I did like them.