I see GPS much like other advancements such as the AI. They all encourage longer and more challenging flights and may have some downside. However, overall I see it as a big positive. GPS in particular is a huge help in today's TFR environment as is down linked data. Combining the two makes navigating in todays's political climate much easier. Airspace is much more complex today than 50 years ago when my cousin was flying her Luscomb cross country.