My opinion is that in time Bitcoin market share will keep reducing, as many other coins and tokens and platforms will keep surging.
In the long term, the blockchain technology is very disruptive. Bitcoin will more likely compete with Gold, Ethereum will provide a backbone for many uses.
So I am not really sure a collapse is incoming, it depends if a real bubble will quickly form.
I don't think so. Every crypto trader or person that have been in crypto from a while have complete faith on Bitcoin. It's been the history of Bitcoin that it's price fluctuates a lot. If you look on the graph of 2017 then there were many ups and downs during the whole year and similar pattern is being observed this year. P.S if you exclude January from it