Nash/Smart
Kobe
Marion/Rush/Ariza @VetMin
Bosh
Pau
While I agree with your premise that team will never win anything, just like they weren't going to win anything with Dwight/Artest instead of Bosh/Marion. They have to go younger and more athletic or they're toast.
You left out Smart as their defacto starting PG and I'm not sure they wouldn't win anything. Your premise of youth+athleticism as the basis for championships isn't exactly well cited or even well guessed. The Heat were the 2nd oldest team in the NBA last year, 5th oldest the year before. The Mavericks were the oldest team in the NBA when they won it and their athleticism consisted almost entirely of JJ Barea. When we won it we were the 8th oldest and it's not like we jumped out of the gym. I'm not convinced the Lakers need a youth movement. I think they floundered last year because Nash couldn't stay healthy and D12 hasn't been the same since his back surgery. Also Bosh and Howard are extremely different players which would put Pau in an entirely different position as mid-to-low-post center. I had to go back 10 years to find a team who won the championship without being in the top-3rd of the league in age. It was the 2003-04 Pistons.
I wouldn't consider moving Rondo for anything out of the top-3 and no GM in their right mind makes that deal with us. Assuming we get one of the 3 top picks I'd take Rondo's established game over even a 50-50 flip at getting an all-star in Exum/Smart/Randle. Rondo is also a badass. Played with a broken arm and a torn knee. Unbelievable.
I wish people would stop judging Rondo's trade value on this season, other GMs aren't. He has zero incentive to play like he has in the past. We're trying to lose, his cast is pitiful and he's still recovering from knee surgery. He knows that even if he put up a triple-double every night we'd struggle to make it to .500. You won't see the pre-injury Rondo until next season and I think most GMs know that.