Re: Launching the Antminer L3+, World's Most Powerful and Efficient Litecoin Miner
I just checked and it would take a difficulty of 4,500,000 for 1 antminer L3+ to make 0$ profits 
Then you can rest assured that this will not happen. Mining will always be profitable. But, only for those with low cost and high efficiency. It's mathematical. If it weren't true, the Block chain would cease to exist. That is not going to happen. The block chain will survive. On low cost and high efficiency mining.