Dunno really, GLS is operational in euroland, but not in the US. EGNOS is our own version of WAAS, however it is true that WAAS is not enough to do CAT I approaches here, you do need a ground based augmentation system for that at the moment, however i expect that to change. Since one GBAS is enough to provide around a lot different precision approaches within 50NM it is especially for areas with more than one airport a nice way to provide (in the future) CAT IIIc approaches for not a lot of money at all.