Realism
I'm not fundamentally against Scottish independence nor am I particularly in favour of it (though personally if there has to be change I'm more in favour of greater national devolution and a more federalist UK). However the nut jobs in Scottish parliament seem to have no grasp of reality especially when it comes to their future economy.
"The SBS would also inherit a proportionate share of the BBC’s commercial ventures, including BBC Worldwide Ltd, and their associated ongoing profits."
So you want to separate yourselves from Britain and its government and public institutions such as the BBC but you want to keep your own replacement propped up with profits from BBC. Sure, that seems a totally fair and completely independent plan.
What next? An independent Scotland should get a portion of UK licence payers money because those in Northern England can receive broadcasts from the newly formed SBS?
Combine that with other wonderful plans such as a pinning your national economic future to a currency union with the rest of the UK, which the UK government has already said they won't agree to, and you have the picture of an independent future of economic ruin and chaos.
Proper planning prevents p*** poor performance and all that.