If you're basing your thoughts around the huge gains at the tail end of 2017 and early 2018, it might seem that way. The last couple of months have shown a more healthy trend. Crypto isn't going anywhere. If it continues the way it's going at the present, things should be fine for the long run. That said, Bitcoin is probably going to be dethroned at some stage with newer and better technologies coming out of other companies these days.