I don't think they're going to carry it out, if that's what you mean. But the claims that Scotland will be refused a currency union, will be refused entry into the EU, and so on, represent nothing less than threats of economic violence by Westminster. That they're delivered in a passive doesn't change that.
I don't think that's true. If you want to protest Westminster, you vote SNP, who have the same vaguely social democratic policies as Labour, but with an explicitly anti-Westminster slant.
If anything, independence will probably be a boon to Scottish Labour, because they'll be free of the shackles of the Westminster party, which means they can advocate a more definitely social democratic policy and have it taken seriously. There's already a strong minority in the Labour Party who support independence, and the distance between the SNP's ~40% of the electoral vote and the 50%+1 to secure a "Yes" will be made of working class Labour-voters. The problem is, this will involve the current Unionist leadership getting the heave-ho, so there's no way the Party can recognise this explicitly.
Long-term, I think the party-system you'd be looking at in iScotland will see Labour and the SNP as major parties, the former as centre--left social democrats, the latter as centrist liberals. The Conservatives will continue to lurk on the right, while the Greens will probably secure a presence on the left as the SNP sheds its progressive vote. The Liberal Democrats are pretty much done for: their place in Scottish politics was always as the voice of the Highlands & Isles, too rural for Labour but too poor for the Tories, and the SNP have near-totally usurped them in that role. I think their best prospect is a merge with the Conservatives, perhaps reviving the old "Liberal Unionist" banner?