My opinion: Point guards don't win titles. Big men do.
And yet you want to sign Deron Williams to a max contact. 
That's an idea. I like Deron over Rondo, because Deron does everything Rondo does... but is bigger and a far better shooter/scorer. Deron is just a better player. Period. Obviously wouldn't be the end-all move. You don't simply win a title with Deron Williams by himself and you sure as heck don't simply win a title with Rondo by himself. But you're leaving out the key part of my Deron Williams pipe dream... if you signed him to the Celtics you'd then be able to move Rondo to the highest bidder. Ultimate fantasy is landing Dwight HOward for Rondo, both our first rounders + whatever else Orlando wants...
Also the only reason I mention Deron is because he's BY FAR the best unrestricted free agent this offseason and we happen to have cap space. If our MVP Kevin Garnett retires... I'm not sure how else we could make an immediate impact this offseason.
Sure Deron Williams does everything Rondo does, but Rondo does quite a bit of it better like passing, rebounding and playing defense. Williams shoots better from the perimeter and scores more points.
I don't know if you find playing D, rebounding, and passing to be irrelevant, and shooting the basketball to be the only skill that has any significance, but it sure seems that way.
No. I think in the right system and teammates, Deron WIlliams has the capacity to be an excellent rebounder and defender. He's got size on the majority of point guards in the league. I think all-around he's an upgrade over Rondo. Deron is Probably the 2nd best point guard in the league behind Chris Paul. Him or Rose, I guess. In the past some have argued (somewhat convincingly) that Williams was better than Chris Paul. He's top 3 for sure. Rondo's great in his own right, but not on the level of those guys. People take that as me hating Rondo. Not true. I love Rondo. I love Paul Pierce too (named my cat after him), but that's not going to stop me from admitting he's nowhere near LeBron's level. I love Ray, but that's not going to stop me from admitting he's not on Kobe's level. I loved Big Al when he played here too, but it didn't stop me from admitting he was nowhere near Kevin Garnett's level. It is what it is.
There are really really good players... and then there are great players. When in comes to Pau Gasol, I'm in the camp that he's one of the best players in the entire game. Last year, statistically, he was top 5. This year he 8th. That's impressive when you consider what Pau's role is on the Lakers now that Bynum has asserted himself. I'm one of those people who credits Pau Gasol with the two Laker titles even more-so than Kobe Bryant. While Kobe was winning 34 games with Lamar Odom and Caron Butler on his lotto Lakers (
http://www.basketball-reference.com/teams/LAL/2005.html ), Gasol was off in Memphis leading them to back-to-back-to-back 45-50 win playoff appearances with Mike Miller as his 2nd best player (
http://www.basketball-reference.com/teams/MEM/2006.html ). In 2010 when they beat us, Gasol averaged 19 points, 12 rebounds, 4 assists, 3 blocks in the finals while shooting 48%. Kobe chucked his way to 28 point average on 40% shooting and ended up winning the MVP. Kobe was 6-24 in the a deciding game where Gasol had 19 points, 18 rebounds, 4 assists and 2 blocks over us. Frankly, Gasol earned the Finals MVP that year... not Kobe. Pau killed us. We were destroyed inside (especially with Perk out). Way too much size and we couldn't deal with them. We have lost our last 3 games to the Lakers for that same reason and will surely be owned by them if we see them in the Finals (last time we beat them... both Shaq and Perk were in our lineup). Dominant big men are difference makers and Pau Gasol is 4 years younger than Kevin Garnett. This is a Celtic forum so people rightfully hate Laker players... but ya'll should be thrilled the Lakers are so poorly coached right now, because if they ever figure out how to ride their dominant big men this year... they are going to win the title.