FlightPathOBN:
Just as with WAAS in the US and MSAS, SBAS is an oddity, requiring instrumentation, certification and availability, that just isnt really worth the cost.
Rebuttal:
There are now more LPV than ILS approaches in the U.S. LPV has gained broad acceptance in the general aviation community. Unlike most CAT 1 ILS's LPV is rock solid to touchdown.
What is the oddity is RNP AR, with its bar set so high that it is worthless to all but some air carriers, for which the incremental costs are far less than for the aviation community in general.
BTW, where is the reference on those 2.8 degree paths you asserted a couple of days ago?