Kit
I would put my trust in GPS any day over ADF.
In the event of a failure of the approach aid, whether it's GPS or an NDB, the procedure is the same and often you have the same degree of guidance available... GPS doesn't add a new dimension to the problem.
Plenty of places now have standalone GPS approaches operating, and I've flown many of them in the last year. So far so good.
I'm not clear what point you are attempting to make about GPS. Are you suggesting as seems to be the case in your first posting, that they are not adequate to be a primary source of approach guidance? If so, are you going to tell the FAA and the many other authorities who think otherwise, or should I?
When we talk about overlay approaches, I know that the correct response is to tune and trust the underlying approach aid, but given a choice between an unflagged GPS and an NDB on a stormy night at a coastal airfield, I wish you all the luck in the world with your ADF.
2D