Would be a shame to see them go, but they have the right to do so, the Better Together campaign has been a bit of a damp squib and it was a bad move to put the former chancellor at the head, his past has just overshadowed the whole campaign.
Honestly I think their long term prospects aren't as rosy as they think it is, but if they made the right choices they could make a go of it. Expect a lot of sour grapes from Westminster and feet dragging if they do split.