I fly a fair number of NDB approaches in fact coupled with the occasional NDB/localizer approach it's pretty well all that I fly.
OK they might not be the worlds greatest aid but they do work and I tend to find most of my inaccuracies due to my flying.
They are also a lot of them about. Off the top of my head I can't think of a single airfield with an instrument approach that doesn't also have an NDB approach as an option and frequently forms the only approach onto the "non into wind" runway.
I'm also under the impression that the operational costs of an NDB approach is low. Hence they may well be around for a lot longer yet.