If the Bitcoin market capitalization reaches that $6.7 trillion now then the price of a single coin is $400,175, that is times 22+ of the current value and that's not impossible for Bitcoin to achieve as it continues in increasing. For me the Dotcom bubble can only compare to ICOs right now and never to Bitcoin because we all know that it never support this ICOs, Ethereum did. It just that there are companies that accepting an investment from Bitcoin but that doesn't mean it supports it.

Dotcom bubble, Tulip Mania, Y2K etc... are the issues that already happened in the past but there are people that keep on relating it to the Bitcoin's success right now. The money inside Bitcoin is just a small portion of the total money that is circulating in the world so for me it's better to wait what will happen in the future(less headache) as there are unlimited predictions by different people who thinks they know everything.