The trouble with this debate is that it's been framed as an economic debate by the Remain campaign when, in fact, it's a question of identity.
When it comes down to it, the economy (as defined in macro-terms) has been fairly resilient since 2016. The UK economy's generally outgrown France, Germany and Italy between 2016 till 2019. Then Covid-19 was a death blow but most independent forecasts have the UK recovering at the same time as the Eurozone by next year - mainly due to the vaccine rollout. I suspect, once things net out, the general public won't really care because the vaccine rollout has shown that success will be framed in relative terms rather than absolute and Swiss-EU relations suggest that buyers regret is unlikely as time goes on. All the while the real risk is that Europe (including UK) is facing another decade of stagnation and we're going to shift even more to a service oriented economy that does little for equality across regions.
