Discipline, or the lack of it, has certainly contributed heavily to Scotland's difficulties on the pitch. As to what the SRU can do - well since they have control & responsibility for the game there, it's reasonable to ask them to provide solutions for Scottish rugby. »
In fairness, you make a critical, but fair point. Presently, Scotland are on their way down the rankings, and the teams directly below them are on an upward path. Perhaps it remains the case that unless (and until) Scotland lose their place in the Top 8, the SRU won't act. In the meantime, it will be interesting to see what Cotter's approach will yield.
Doubly ironic that Henson's name should be brought into any discussion of Warburton. Henson, talented as he is, has been the author of his own misfortune on multiple occasions, whereas Warburton, talented as he is, is the result of Gatland's obsessive belief that he is a better player than he has shown. I have huge admiration for Warburton's courage, workrate and loyalty, but he is just not as good as Gatland thinks he is.
The figures quoted are from the IRB website. They serve only as a rough indicator of 'rugby strength', but are nevertheless useful. Were Scotland to fall below 8th place in the IRB World rankings, currently occupied by Samoa at 9th, Japan at 10th, Fiji at 11th and ARGENTINA at 12th, it would be of real concern.