This is a right-wing Republican argument - but - who knows when the US will have another right-wing republican president? In less than four years? And who knows exactly what Obama and the Democrats think of Scotland and NATO?
The essence of the argument is all here - it contains all the contradictions inherent within the SNP's hotly-debated policy shift last October. They weren't successfully addressed or answered then - and Angus Robertson did not successfully address them in the debate that immediately followed this. Jim Murphy was of course in his usual backroom Glasgow political brawler mode, and betrayed all the intellectual poverty and hypocrisy at the heart of the Labour position.
Only independence - and an election in 2016 for a truly independent Scottish Parliament - will resolve these matters.
Since the Scottish Labour Party that contests that election will be a very different beast to its present expedient, power, money-grubbing and militaristic incarnation, who knows what the outcome of the 2016 election will be? The same will be true to a lesser degree of the LibDems. The Tories will still be Tories ...