While they did say [above] that not all of the motors would be discontinued, some might be relegated to special runs or once a year runs. I couldn't see the old K458 being completely discontinued. Its the original oil can motor. I think it might have fallen out of favor due to the grown prevalence of FG kits now which are heavier that older paper rockets and while the K458 is no slouch, its not up to the task for most 98mm FG kits save for a very select few. And obviously the random oddroc.
I think the K650T though is a pretty beefy motor and has far more viability. People just need to make rockets for these motors!! Maybe AT needs to contact the rocket kit MFG's with a list of good motors, but need good hosts!?!?!?!
I would be willing to bet Tim and the others could whip up some cool kits for some of the more odd but cool motors that are looking for a home. Though, that might be a little bit backwards as far as product development goes, but hey, I am an unconventional engineer!!
Personally, I think the guys at LOC could make up a few really cool paper rockets that take 98mm motors and could be flown on the oil can reloads (98/2560 for the n00bs). And with their MMT conversion design they have now, you could swap in 75, 54, clusters, etc in lieu of the 98mm MMT.