The only thing I can say about the dangers in 2018 is that we had the same dangers in 2017, 2016 etc. etc. I do agree there is danger in the future but when. I do give the powers that be have done wonders in kicking the can down the road for these many years. Play it safe and have some silver and gold. Problem I have with cryptos is I do not know which ones will be good. I have steem because of steemit.