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.
Bitcoin can survive and will not collapse so easily, bitcoin will be able to rise at a better price, and remain in its popularity to be the main crypto coin.
I am always optimistic that bitcoin's value will not reduce. instead it will increase at huge amount by the end of this year 2018. Many investors have fated with bitcoins future ,that it can survive this challenge, though this past few weeks it was fluctuating. And I strongly beleive bitcoin will be on top in this cryptocurrency.