What will be the future of the SNP in an independent Scotland?
They would attempt to become Fianna Fail Alba (more or less). Whether they'd be successful in that is impossible to tell.
The SNP will sweep all before it in 2016 but without Salmond at the helm (he'll find something else to do) Nicola Sturgeon will lead and become the first FM. It will have a dominant hand in shaping the country. It will probably win in 2021. You're probably right that they will try and be a Scottish 'Fianna Fail'. One party always dominates Scotland and it has shifted from the early 20th Century from Liberal to Unionist to Labour and potentially now to the SNP. If the party holds together it may dominate politics for a generation. The electoral system however might make it the largest party, but the other parties can challenge if they come together.
Labour will suffer in the short term. Lamont will go. The Holyrood wing and the Westminster wing hate each other and will jostle for influence (and seats) in the 2016 election. Might do worse than they did in 2011. After that point, I think they will pick up. However in order to challenge the SNP they might find themselves having to go into some sort of coalition with the Conservatives (think Fine Gael/Labour but reversed in strength) and smaller liberal/green parties. I used to think the SNP would take their place to Labour's right post independence but I think they might sit more socially 'left' initially.
The Liberal Democrats start at such a low point that they will rebrand. Might stumble on for a few elections but given that their vote moved en masse to the SNP in 2011 and probably won't come back, the party might fold.
The Conservatives will get over the result; Ruth Davidson will step aside for Murdo Fraser and position themselves into the biggest cheerleader for the free market and probably become a little more socially conservative. Might actually start to recover.
The Greens will have a good election in 2016 but will remain a hostage to the fortunes of the larger parties.
Tommy Sheridan will be back. We'd see how long he lasts.
I wonder if we'll see a UKIP-esque populist right-wing party grow in Scotland. After all, they do talk about wanting to be like the Scandinavians - what could be more Scandinavian than a raging right-wing group hovering in the background?