WSJ conducted a survey on 53 economists, and 51 of them say Bitcoin is a speculative bubble

Well, then it must be official now, no? Kidding. Here's some of the feedback on what the so-called economists are saying from the article:

"If it looks like a duck, and quacks like a duck, it's a duck," said Diane Swonk, founder of consultancy DS Economics.
"The news of new highs seems to beget more action and a new high-a clear sign of a bubble," said Amy Crews Cutts, chief economist at credit-reporting agency Equifax.
"Now that deep envy has set in amongst those who do not own bitcoin it seems this mania can enter the final stage; one which can exist for quite some time before panic and crash come into play," said Constance Hunter, chief economist at accounting firm KPMG LLP.

The article can be found here.