Short term it is going to be bad for the UK. It will have to renegociate trade agreements, this will create lots of uncertainty which isn't good for the economy, and also lots of market volatility.
Long term the EU is going nowhere, it is dominated by socialist countries that will go the way of Argentina, a slow but steady decline (well under way). And the migrant crisis, which is likely only at its beginning (look at african demographic projections), combined with Brexit and the rise of populism all over Europe, will likely put such a strain on the EU that I think its days are numbered.
So on the long run, I think the UK has probably made a wise choice.
Long term the EU is going nowhere, it is dominated by socialist countries that will go the way of Argentina, a slow but steady decline (well under way). And the migrant crisis, which is likely only at its beginning (look at african demographic projections), combined with Brexit and the rise of populism all over Europe, will likely put such a strain on the EU that I think its days are numbered.
So on the long run, I think the UK has probably made a wise choice.