A lot of the chatter in this post is about the underlying value of Bitcoin (and blockchain currency generally) as an asset class. I keep telling folks: yes, it absolutely does have value apart from sentiment; holding a blockchain currency gives you access to all the infrastructure built on that product -- regardless of whether that infrastructure is for exchange, or storage, or smart contracts, or whatever.
It follows that the worth of a specific blockchain currency is tied to the usefulness and -- to be brutally honest -- the coolness of the underlying technology.
This is why you should short BTC (and even ETH). Both are proof-of-work, both consume massive amounts of power, and both are increasingly useless for transacting. Eventually, the slow deprecation of Bitcoin as a means of transaction will make the underlying infrastructure (appear) worthless, and at that inflection point, it becomes worthless as an asset class as well, as it will no longer be a stable store of value.
So take all your winnings from the Bitcoin lottery and plough them into something that actually has legs.
When my 'sell' threshold hits (I currently hold ETH), I'm buying the shit out of, e.g., Cardano, and Stellar Lumens. And if the blockade by the old guard ever cracks, TenX -- connected to a payment card -- will be sex on legs. (Ok currencies can have neither sex nor legs but you get my drift.)
I am explicitly buying as an investment in the technology. Believe in functional coding and smart contracts? You could do a hell of a lot worse. Mutatis mutandis, Stellar Lumens; different virtues, but also impressive.
I can see both technologies going forward, and I believe in both of them. Can't say the same for Bitcoin anymore.
Finally, talking about infrastructure, also evaluate who the infrastructure is for, and how good it is at serving them. It probably makes sense to hold some Monero right now, as, like it or not, the traditional guarantor of value for Bitcoin is its utility in doing shady stuff. Privacycoins meet the needs of Bitcoin's original audience better than Bitcoin ever did.