In the grander scheme, it seems plausible that there will be one or a few cryptocurrencies of the current era that will withstand the test of time and emerge with large-scale adoption rates in various markets. But with BitCoins technical limitations I really don't see it being a mainstream medium of trade one or two decades down the line. With that conclusion in mind, it seems inevitable that the BTC market will cool off eventually. And my I would never put my money into something that I don't believe in over the long term. I would be more interested in an ETF or other derivative that tracked the value of a basket of viable cryptos.

Blockchain/cryptocurrency is going to be really useful and valuable. It would be an enormous coincidence if much of that value wound up being tied to bitcoin though.