The way we eat meat today is very "broke" and certainly not sustainable over the long term.
Worst case scenario is we enjoy it while we've got it, then miss it when we don't.
And precisely what is the sustainability of lab meat? What makes you think lab meat will be more efficient that raised meat?
Yuval Noah Harari, on the second video (ca. 0:40) states the reasons why he thinks cultured meat will have a smaller ecological footprint. He says: "When you don't have to raise an entire cow in order to get a steak, when you don't have to raise an entire chicken to get a schnitzel, you just need this particular piece of meat, these particular cells, it reduces considerably the amount of water, the amount of fuel, the amount of nutrients that you have to invest in it, and also the amount of pollution that you are creating."