To those Scots wanting to leave: "once in a generation"; you've had your chance.
Pretty much the same as those wanting another referendum on the UK staying in the EU.
That's pretty much the view of the majority in Scotland as far as I can tell. However to those that want independence it doesn't matter and however many attempts it takes is acceptable. And to a degree that's the audience the pro independence parties are playing too.

As mentioned above, anyone outside of the Scottish electorate is an irrelevance. Your perceptions and opinions aren't factors regardless of how logical or pragmatic.