If you could give up anyone but the Big 3, I'd say do it. You all may not like Kobe, but you can't deny the guy is a talent of the highest level. As for Kobe taking Gino's position, the 2/3 spots are almost interchangeable in the Spurs system.
Having a lineup of Parker, Gino, Kobe, Duncan and Oberto/Elson would be sick. I'd imagine it work for a couple of reasons: 1) Duncan is not Shaq and doesn't mind taking a backseat so others can shine bright. He just cares about winning. 2) You'd have to hope that Kobe learned his lesson with the whole Shaq feud. Plus RC is light years ahead of Kupchak in the GM department.
And I'd imagine Pop could connect with Kobe because he'd be real with him, and not just make foolish promises to woo him over. He'd expect Kobe to earn his spot on the All NBA Defense team, and Kobe is still athletic enough to become a great defender.
The trade is probably not possible and/or too expensive, but if the Spurs front office figures it out without trading Parker, Gino and Duncan, you'd be stupid not to do it.
Think about it, 3 nearly impossible to guard perimeter players with range flanking Duncan who's still the best big man in the game. Who dangerous would the Spurs be? You'd have a PG that is getting better and better, and now adding his shooting to his quickness, can be a pain to handle. You'd have a 2 guard with no fear who is so unorthodox, most defenders can't stay in front of him, in addition to his clutch shooting, and ability to get to the basket and take a hit. You'd have the superstar SG/SF who can finish over anyone at the rim, also has no fear of the big stage, and is also impossible to stay in front of, especially when he's firing on all cylinders. Plus, some work with Chip would only make him more dangerous.
Oh, and you'd only have the best player in the game in the post, who's unselfish play makes everyone go. The guy who gets easy shots for EVERYONE. , with some practice, I could probably chip in about 10 points from the perimeter with all the open looks I'd get with Duncan in the post. He leads by example, works hard, plays the post better than anyone in the game. Oh, and he's been known to get tough baskets when the team needs one and lock down the paint on the other end.
And of course, the garbage man Oberto cleaning up everyone's mistakes.
Why wouldn't you want a team like that?