A majority of our new / and proposed AP's are the 2 series. Where I have the 135's right , it's mainly in area's where there the load is minimal, clients connecting to it primarily are mobile devices , so it's not really loading it up at all.
From a money standpoint, even if I do replace these EOL 13X series, I would just replace them with a 115. However, I don't see if there is any benefit upgrading them...these 13X just won't die ;-/