I think we will see a huge increase in price for bitcoin to be profitable to miners.
800 USD is good target, but because of the hype it could go easily above 1k imho.
Yes. I'm not so sure about $4000, but I think maybe $2000 would be possible.
You forgot the 3000$ ,,i think 3000$ is the next bitcoin price after halving .
And when they dump at that price ,2000$ is the new lowest price of bitcoin .