^ The UK is certainly dropping fast but it's a long way from a failed state.
If the UK swallowed its pride and asked to rejoin the EU quickly enough then there is a good chance of recovery. It would have to concede some of the privileges it used to enjoy and may be forced to join Schengen, which would probably benefit more than people realise.
The Euro may be a step too far for some but it would strengthen the Euro to a point that it could top the dollar for the dominant currency in world trade, which would be a significant step forward. The exchange rate currently favours the UK joining and for most, including industry, it would be a major benefit.