FoS is an irrelevant, parochial dirge which, alongside GSTQ, makes me aspire to be reincarnated as a national of a country with a decent national anthem.
Scotland The Brave has a tartan shortbread image, Scots Wha Hae has exactly the same problems as FoS, whilst more promising, upbeat songs such as Caledonia and For These Are My Mountains are relevant only to those who've buggered off to live elsewhere.
Personally, I'd be up for nicking the French or Italian tune and shoving some pro-Scottish lyrics, extolling our nation's virtues on top of it.