A very very good explanation as to why BTC will crash even though blockchain is a good tehnology.
If you do not want to read the full link below, here is the key part of the comparison:
"
imagine that someone had found a cure for cancer and posted the step-by-step instructions on how to make it on-line, freely available for anyone to use.
Now imagine that the same person also created a product called Cancer-Pill using their own instructions, trade marked it, and started selling it to the highest bidders.
I think we can all agree a cure for cancer is immensely valuable to society (blockchain may or may not be, we still have to see), however, how much is a Cancer-Pill worth?"
Clearly Bitcoin is like cancer-pill - and we have already seen thousands of new coins (cancer-pills) appear. Eventually their price will be almost zero.
The full explanation can be found here:
http://www.mrmoneymustache.com/2018/01/02/why-bitcoin-is-stupid/Previously, few knew about Bitcoin and really they used it and everyone did not care how much it costs. Now the housewives are on the market and say that it will all collapse. For them, yes, because it may not justify their expectations about the price and not allow them to make money out of thin air. But Bitcoin will not go anywhere and always find his user.