Scotland's  has the lowest life expectancy for men in Europe and that includes the poorer eastern European countries. Their life style  is appalling, some Supermarkets don't even stock fresh fruit and vegetables because there is no demand.  Having lived in Scotland for many years but originally from England I would have been delighted for them to separate.
As for the territorial waters,  not as much belongs to Scotland as they think. Follow the line of the  the land boundary up - as is the way its done- and it cuts through the territorial waters they think is all  theirs  when they look due east.  Also North Sea oil is rapidly running out and at $50  brings in  less than half the income compared to the time they voted not to separate.