Admittedly, I don’t know much about Brexit, but from what I have been exposed to, it seems like a decisively economical and political impairment that made travel and business with the rest of Europe more difficult and costly. Since it is so highly criticized as a terrible move, why doesn’t the UK just rejoin the EU?
One of the requirements is that all members vote for admission. Spain may not want to vote in favour because of the Gibraltar situation. I’m assuming Ireland won’t reignite the whole civil war for Northern Ireland situation, but who knows. The UK pissed off a lot of countries during Brexit.
Just having money isn’t enough to be admitted, either. There are also strict requirements about democratic status and transparency/corruption. Ironically, a lot of those requirements were put in place by eurosceptic politicians.
With a national debt far exceeding the 60% limit the Maastricht Treaty describes and inflation across Europe far exceeding the max of 1.5%, I think it’s very possible that the EU would demand financial reforms despite the UK’s high GDP.
Just having money is not enough. I’m sure the UK could make it back in, but it’ll require more than just some token paperwork, and the UK would lose all of the privileges and exemptions it had before.