QFF, in short....no. GPS won't be allowed in lieu of NDB as a blanket change. The protection areas are too different. In order for that to happen the ndb procedure will have to be re assessed using GPS protection areas.
It's more than GPS being more accurate. It may be more accurate, but how do you know when you are getting that accuracy? It's for this reason the protection areas are a little larger than those for ndb.
Alpha