I don't think it's very smart to dump ground based Navaids. Relying on one system down to minimums with terrain all around, furthermore subject to the military playing games because they think Iran is using GPS to fly a drone around that day, thinking that one little box in your aircraft is 'enough' to get you from point a to b is 'hopeful'.
Maybe I have been flying in the soup to long, but I have seen GPS 'problems' and I am more comfortable having multiple systems backed up telling me where I am and where I am going.