The noble prize winning economist Robert Shiller has always been very sceptical about Bitcoin. As most economists he sees it as a big bubble. But since bitcoin is not 'created' by the government but by some smart computer scientists, believers / investors always will have the feeling that Bitcoin has some real value. Just like other store of values. So it might not disappear quickly.
Source + more information: https://www.newsbtc.com/2018/04/16/economist-robert-shiller-says-bitcoin-bubble-may-never-burst/
picture source: https://www.cnbc.com/2017/12/19/robert-shiller-bitcoin-valuation-is-exceptionally-ambiguous.html