Most airlines arent bothering keeping the CAT cert up, as they very seldom are cleared to use them. Its a huge expense, from training down to the navdatabase.
I heard from United that due to costs, they are letting quite a bit of the RNAV drop off, as they seldom get cleared by ATC for an RNAV APP, and virtually never for the RNAV DEP.
This happened with SW and RNP, get trained, get cert, pay to add the procedures into the navdatabase..then never get cleared to use the procedures.