I had a friend who knows more about TERPS criteria for building approaches then I do by far. He did not think they can build a GPS or GPS/RNP approach without a runway realignment. I suspect the powers to be also know that or they would not have been looking at a realignment in the first place. SailJib may be correct on the need for a runway but it's all irrelevant if the airlines will not fly scheduled service there absent a instrument approach.