I never said it wouldn't. I said it took 80 years for Ireland, and for much of that time it was significantly poorer.
Independence may be good for Wales. I think it wouldn't, especially initially and I struggle to see evidence for that, but I recognise it could be. It's not me being absolute here. It's not me claiming these things are a no brainer.
The fundamental weaknesses in the Welsh economy are not caused by being part of the UK.