You're right. It's not looking good, but do you think his career is over? That would be unfortunate and sad,,
No, I don't think his career is over, but it will not go to mid thirties. It depends on the actual problem his knees have; if it is something like a bone bruise, then he will return within this season. If it is weakened cartilage for sure (as reports have been saying), then it is very serious, and will not heal completely even with time. Bynum is set for life with the money he has earned with LA, so I cannot say for sure how long he will play.
On the other hand, Howard has been a good center for LA in his time here. I originally advocated against the trade, but I cannot deny that we are much better off after. (in response to many of your posts here)