Which is a shame, because the blockchain is amazing technology.
No one is buying bitcoins to put them on a shelf because they're pretty. As long as Bitcoin goes up or serves in some sense as a financial reserve it's probably not going to "go out of fashion."
Of course Bitcoin may still be a bubble, but it would be a bubble for different reasons.
I don't understand this sentiment. I bought a new gaming PC last week and not only did I use Bitcoin to do so, but I specifically chose Newegg because they supported Bitcoin payments.
Apart from wasting space (e.g no cleanup even after years), energy, and calculating the nothing, sure, it's amazing.
(I might have a different opinion, let the proof of work be calculating SETI, math questions or science problems)