I keep stoneskin up near full time (only exceptions are if it wears off mid NM fight and said NM has moves that could potentially one shot whoever is tanking). Generally the only reason I cast repose is because the black mages and/or red mages are slacking for one reason or another, or they missed one and it's hitting me for some reason or another.

Like I said (or what I meant to say), it would be nice to have, and I wouldn't be at all disappointed if we were to get it, but from a healer perspective, I just don't see it happening.