The problem with the market that I think eventually will develop is that wheel manufacturers will reduce the specification of the rims to the point that if they are used at all for old-style brakes, they will rapidly deteriorate to breakage.

The perceived popularity of disc brakes will see even standard rims having deceased production in any form, as the thinness of the rim walls takes over.

I have several bikes with disc brakes operated by cables, but with good-quality rims. For the type of riding that I do, and am likely to continue, the disc brakes don't offer me any significant advantage in my judgment with one exception -- the tandem when ridden in really long and deep downhills with corners... and even then I would be uncertain as to the required ongoing performance potential. I am in the process of acquiring rear wheel disc brake assembly, but the project of not completed yet in planning.