"On what possible grounds do people such as yourself believe Scotland be be incapable of surviving in a similar state? "
Oh I'm sure Scotland would survive in a similar state. Quite whether it would be more desireable to be like, say, Greece (25% unemployment, 50% youth unemployment, GDP down 15% since 2011, government debt 176%, elected government deposed by Euromaniacs) than being part of the UK is questionable. However, if you believe that any member of the EU enjoys "independence" I think our definitions of that word might differ slightly. Then there is, of course, the tiresome detail that an independent Scotland would be almost certain to be denied EU membership.
As I've said before, I don't believe Scotland has any more claim to independence than Liverpool or the Isle of Wight but I'm not particularly fussed one way or the other. I just wish they'd either get on and do it or stop harping on about it.