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.
No it will not collapse, the price of other cryptocurrency that are being rejected by the investors will just die because the platforms are the reason why ico's should be competitive in terms of long term investment in order for their own project to be chosen by different investors in the market.