The phrase "widespread speculation" means when many people are making guesses or assumptions about something without having definite evidence or information. Full definition
Despite widespread speculation, the possibility of the signals coming from an advanced alien civilization has been largely ruled out. (newsweek.com)
The Chinese magazine also mentioned the same in their recent story which brought ahead widespread speculation in the market for digital currencies. (kryptomoney.com)
There is now widespread speculation that state lawmakers will delay full implementation of the standards and related assessments. (e4e.org)