Yeah. I mean, really, that 16-50 would be a dream lens for me if they'd just squeeze a few more millimeters on the long end, were that feasible (I'm pretty attached to the 85mm FOV on film,) ...I'd be starting to save now, practically. As it is, I'm not really planning on one, unless my habits change a lot and I really want something that goes down to 16. (stuff that wide is to me, mostly just for a bit of fun and pretty utilitarian snapshootery: I just don't want to carry a separate wide until maybe I can afford a little Limited one, and that's way down the priority list.
) ..I'm not figuring it's a great idea to try my luck with used ones, except maybe here where people can say if it's a good copy)
Anyway, yeah, even if they had to do something special just to make sure most of those 16-50s going out were trouble free, they probably should have done that. You don't want to be giving people the impression that a bad lens is the best you can do.
As for the FD-EOS transition, Canon nearly lost me with the T-series, and the cheapification of a lot of the lenses for compactness cause everyone wanted light and small. I nearly went Olympus, then the T90 came out and I figured there was hope yet.
The big difference here, though, is that the FD mount was a legacy of the original Canonflex, and the mount just wasn't made for body-driven AF. It was made to never, ever, wear out (at least not from bearing surfaces defining the lens position: no matter how many times you mount or unmount things on a camera, the surfaces that define where the lens is stays the same. Possibly overengineered, but this was the rationale.)
Pentax isn't being held back by a concern like that: I gather they're shaving costs and weight by making some lenses electronic only, but there's no reason to take the gamble of a lens mount change.