I already eat mycoprotein grown in a vat:
http://en.wikipedia.org/wiki/Quorn
My boyfriend is a vegetarian, so we tried these Quorn things. They actually have the consistency and texture of meat, unlike soy substitutes. Their chicken nuggets actually taste and feel like chicken nuggets. Delicious. If you see them at your supermarket, please, grab a box and give them a try
As for meat grown in vats or labs--if it puts an end to the environmental damage that our current methods of meat production cause, then I'm all for it.