My guess is 54% "Yes" and 46% "No".
I found a map showing regional support for independence in Scotland. It says that most of Highlanders vote "Yes".
Then I was curious about population density in each of these regions, including Highlands, and I found this:
http://www.gro-scotland.gov.uk/files2/the-census/Webster_final.pdf
"Scottish Population Statistics", Edinburgh 1952, authors divided Scotland into 3 regions:
Highland = 5/7 of area (21330 sq. miles)
Central Belt = 1/7 of area (4269 sq. miles)
Lowland = 1/7 of area (4196 sq. miles)
Central = Ayr, Dunbarton, Lanark, Renfrew, Clackmannan, Stirling, the Lothians, Fife, the City of Dundee
Highland = everything north of Central Belt
Lowland = everything south of Central Belt
Population in thousands in
1755:
Total - 1265
Highland - 652
(51%)
Central - 464 (37%)
Lowland - 149 (11%)
Population in thousands in 1861:
Total - 3062
Highland - 1020 (33%)
Central - 1769 (58%)
Lowland - 273 (9%)
Population in thousands in 1871:
Total - 3360
Highland - 1041 (31%)
Central - 2047 (61%)
Lowland - 272 (8%)
Population in thousands in 1931:
Total - 4843
Highland - 980 (20%)
Central - 3612 (75%)
Lowland - 251 (5%)
Population in thousands in
1951:
Total - 5096
Highland - 1000
(20%)
Central - 3840 (75%)
Lowland - 256 (5%)
Share of Highlanders decreased during 200 years from over 1/2 to just 1/5 - what is the reason for this?
Also since the Union of 1707, during 300 years population of England has been growing much faster than that of Scotland.
I googled data which says that in the 17th and the 18th centuries Scotland had over 20% and perhaps up to even 25% of the population size of England. Today Scotland has only 10% of the population size of England, so in this respect the union has been clearly disadvantageous for Scotland.
Any explanations why population of Scotland decreased from >20-25% of England's to just 10% of England's during 300 years?