Trust me, instrument "skills" do deteriorate in a glass cockpit. I went from flying dual fms glass in jets for five years and just recently transitioned to a single, first generation fms setup in a turboprop (which is still more advanced than the dc-9) and it took some adjustment. Whether you notice it or not, glass does take a ton of work out of flying-but it has nothing to do with your "skills" as a pilot.
Your post is dead on accurate, but it will fall on deaf ears.(WSurf)