There's plenty of places that have just one aid (NDB) plus RNAV. Sure, if you go there in IMC you will probably pick the RNAV approach to fly before the NDB
Having an ADF, being current on it, and using it for alternate requirements is quite different from chosing to actually fly an NDB appr in anger! Hard to imagine any flying IFR these days doesn't at least have a TSO 129 GPS available to them.
That is if you're RNAV endorsed. There's still those like myself that even after 3 years in FNQ, for some reason, haven't got that box ticked off yet. In fact, less than half my work mates are RNAV endorsed. So it's the good old ndb approach, all over the cape and gulf for us. Mind you when actually in the soup, tracking and guidance is almost entirely off the gps anyway.