I think it is not a bubble but it have strong oponents in DPOS algorithm based blockchains like BitShares, EOS and Steem.
Wrote about in my post https://steemit.com/cryptocurriences/@tombort/bitcoin-is-on-olympus-but-what-hat-come-up-must-once-come-down
and
https://steemit.com/cryptocurrency/@tombort/have-the-dollar-hyperinflation-start-already
Be glad to hear your opinion in my post comments, upvote you!!