The Kiwis have APV ie LNAV/VNAV already without SBAS or WAAS:
The Kiwis also don't
necessarilyrequire an alternate if your destination is served only by a GPS approach. Mucho cost saving in remote areas, although unusual by worldwide standards. Their laws around use of VNAV are quite restrictive for GA, so it's not quite as great as that AA approach plate indicates.
SBAS also removes the alternate requirement, and it seems likely Galileo will have similar availability and integrity, using the same concept as the military P-channel on GPS. It'll be a game changer I think, although not so much perhaps for the airlines locked into using ancient FMS equipment.