And some of the forecasts about Switzerland turned out very real. We have to agree and comply with Europe on most things, without much bargaining power. And the EURCHF swings can literally put businesses to the ground overnight.
Via the EEA, Norway accepted pretty much all of the EU with the exception of the Common Agricultural Policy and parts of the fishing policies, and the Euro.
Unlike the UK, Norway is part of Schengen, and outside of the areas mentioned above, Norway has fewer special considerations and opt-outs from EU directives than the UK has.
If the UK negotiates the same deal that Norway has, the UK will probably do ok, but that would in many areas mean tighter integration into the EU than currently. E.g. joining Schengen, dropping various opt-outs etc. It would also mean maintaining full freedom of movement.
I'd love to see that happen if only to hear the whining from the Leaver crowd, many of whom held up the Norwegian model as an alternative to convince people to vote Leave.
They both have very good reason for not joining EU proper - Norway has a giant fishing industry relative to other industries and Switzerland wishes to preserve her neutrality.
OFC leaving is totally a different thing from not being in at all, but still... there are going to be pro and cons, but the economy will adapt as happened in Switzerland and Norway. Some will gain, some will lose, but the general picture can be valid only in 3-5 years after the Kingdom is out, so not before 2022.