JBGA, the incidents you quote about Glider winch launches, Red Arrow RATs etc are pilot errors, not GPS errors. GPS as a primary source of Nav from A To B will work quite normally regardless of airspace and database updates. Plan the route on GPS, run it in sim mode to check your navigation planning, and then use an up to date chart and Notams to avoid RATs and anything else not in the database. I certainly don't advocate blind unplanned reliance on out of date GPS databases.