No they have not. I have seen 0316 as recently as Saturday the somthingth (last week), and I'm quite sure 0317 is still operational. Apart from the 7, route 12 gets a lot of older buses, so because I frequent that route, I notice the older ones.
Also, almost all of the 40ft buses have received the LCD and GPS/Stop announcement upgrades. The 03XX have not though, probably because their days are numbered. The reason why I say all the 40fts, is because our Arbocs still have not received the upgrade, as far as I can see. I have to wonder what KT plans on doing with them, since the routes they were originally used on no longer exist for the most part.
However, I currently think that eliminating the 12A was a mistake. Frequencies on the 12 are pretty terrible, but it's because the route is so long. I think KT should split it up, and have the 12 run from Kingston Centre to DTP, and 12A run from DTP to the base and back again. The ridership on the 12 from DTP to Hwy 15 is very small, whenever I take it, it's maybe 1-2 people on the bus including me. This is because the 600s now exist, and satisfy needs for a bus route on Hwy 15, plus the frequency of service is much quicker.
But that's just what I think.