I'm obviously in the minority here, but I honestly feel like Dwight, given that he's playing with Gasol, Nash, & Kobe would NOT be that big of an upgrade over Bynum.
Bynum, Albeit isn't a great playmaker in the post, is the better offensive player (Almost By far now) and is younger. Yes Bynum has had "Major" knee surgeries but he looked pretty healthy last year, appears to be past that.(Besides, his knee injuries were due to other people anyway if you get my drift.) Dwight on the other hand, is coming off of back surgery. Do I think that in this scenario Dwight's back surgery is a big deal? Not really, however it is a point.
When you make this trade, the Lakers are getting back a bit of a better rebounder and shot blocker, that's it. (The "Intimidating factor" as well I guess) I guess it would also be a valid point to point that with Nash, Gasol, and Bryant that that's really all you need from Dwight as well so we will see.
Yes Dwight has proven to be a good playmaker out of the post as far as creating double's and triple's but in L.A., how often is that going to happen? It remains to be seen whether Kobe will allow Nash to be Nashty let alone Nash be Nash AND D12 be D12. Kobe himself said he would not play averaging under 20 ppg, and with NASH and Dwight on the squad, anything OVER 20 ppg would be excessive imo.
Bottomline, Even if the Lakers strike and get Dwight, there is still a lot of question marks surrounding that team and are far from Clear cut favorites. But fom a team like the lakers, who has gotten bounced out of the Playoff party in the 2nd round in 2 straight seasons, this is a move you have to make I guess. We shall see.