all tobacco improves with age IMO. Even Lat blends, while they lose strength of flavor, gain in the way of smoothness and complexity. I've smoked 70s era Sobranie, and it was divine.
I have personal experience with old OTC. I have a 1983 tub of Kentucky Club Mild, and another from some time in the 90s. Both had good seals with loud whooshes when I pulled the ring. The 90s version, very fruity and excellent. The 1983 version? OMG, it is like smoking devil's food cake. No exaggeration.
So while aging Burley shouldn't do much except maybe mellow it and lose some flavor, my experience is that they were just as good as old Virginias after a decade or three in the tub. YMMV.