And if that had been the standard for joining the EU or changing its treaties
For joining I made a post a year ago or so that I prefer a >67% majority from the two chambers of parliament plus on top a >67% majority of the people in a referendum.
But for changes....
To have referendums in every member state with a veto on changes means a full freeze in a changing world.... is not going to work.
Better be clear about that so that members uncommitted to the Single Market consequences can leave ASAP the Single Market and withdraw to a customs union.
Leaving the burden of compliance to EU standards to their exporting companies. And do mind: big corporate will not really mind this (they just move plants and whine a bit in public on the capital destruction), and neither top-notch niche smaller companies... it is all the normal SME that will struggle or withdraws to the national economies only.
If you marry up... you are not going to contemplate divorce when discussing buying a new car....
and staying with cars... if the EU is increasing green standards of cars to protect the EU car industry, to protect jobs against Chinese imports...as part of a wider fundamental change of trade strategy happening now... does that need referenda ?
Does the decision on Huawei 5G needs referenda ? It will have a major very long term impact.