My question is if it's still worth buying Asic's and start mining BTC in 2018.
If not mine BTC what other coin is it worth to mine nowadays?
of course, I will always use it because it is still worth bitcoin use. but, if you want to feel in a profitable continue you can use high power to move it. I'm also sure of the upcoming time, all the chaos that happened yesterday will soon recover as usual in the near future.
My opinion is that in order to productively engage in Bitcoin mining at the present time, we need computing power exceeding asic`s in dozens, and possibly hundreds of times. If you want to do mining at home, then the right choice would be mining alcoins.