I don't think too much will change either, if I'm honest. Not in the long term. Ultimately we'll stil need 300k+ immigration per year, we'll still have very similar trade deals as now, and we'll still need to adopt away policy on most things for those trade deals.
The main difference is we'll spend the next 7-10 years paying billions upon billions to lawyers to figure it all out, meaning years of financial uncertainty which will hit everyone directly in the pocket. No thanks, I don't fancy spending bucket loads just to be in the exact same position.