Big setback in production, or just a result of a huge number of orders means production levels won't satisfy them for a while?
At this rate by the time the 17-inch Unibody MBP becomes in plentiful supply, new models will be just about ready to roll out... It's the middle of the product cycle for laptops already, and I can't see Apple delaying the 17 incher again. The delays always seem to be the 17 inch because I guess in terms of engineering it's a lower priority, but the physical redesign is now complete.
So unless you got an early order in that's going to be delivered soon, don't buy a 17 inch Macbook Pro!