How can you call these experts on the issue of EU membership. They may well ( questionably ) be experts in their own field and each has their own interests furthermost in their objectives. Why have we not heard the trade unions, most of whom wanted to join with the communist bloc in the 70's, give there views on English sovereignty.It's not just economists. It's NHS professionals, trades unions leaders, politicians, academics, etc. etc. The list I linked to is vast.
Trying to get blocks of people, NHS employees, Car workers, Students, etc to vote remain may well have been the remain campaign shooting themselves in the foot. Some of these organisations have even sent out directives in writing telling people they should vote remain. But people see what's happening around them and they don't like these organisations conveniently ignoring the things that long term affect them most. Immigration and sovereignty. They may well turn around and say P*ss off and don't tell me what to do.
If you vote out you may well lose your job, if you vote in, you will lose your democracy, your liberty, your sovereignty, and their is no guarantee that you will not lose your job to the millions who may be competing with you for it over the coming years.