Even if you accept the dubious cry of "It's Scotland's Oil" (never entirely true) it looks like the future revenues will fall between 'not very much' and 'naff all'
http://www.telegraph.co.uk/news/2017/01/09/cost-decommissioning-north-sea-wipe-future-tax-revenues/
Which means that all the economic sleight of hand used last time just won't wash in referendum #2
Without support from the rest of the UK (or more specifically England), Scotland is pretty much an economic basket case - think Greece without the good weather.
If they want to go, that's fine - entirely their decision, but I think they'd be mad to do it.
Nicola Sturgeon must know this, but it's an unspeakable truth just now. I expect her to blame all sorts of external factors for preventing a referendum she knows could be a disaster for her and the SNP - whichever way it went ...