Well, I can't vouch for a price drop, but I would guess either holidays or whenever PS4 gets one.
In regards to support, Sony stated at E3 that they will continue to support the PS3 for a little while at least, since we have at least 2 more years of games scheduled. Also, the PS2 only stopped a little while ago. The PS4 doesn't have the fanbase or support yet to carry the company. And since the Playstation division is one of the few things keeping Sony alive, I have to think they will support it for a while.
If you don't mind me asking, why the aversion to buying used?