I don't think you realize how good this team will be if that trade gets done. Its an instant championship. The financial situation after the trade would not be as bad as you are making it out. We'd have a solid 2-3 year window of serious contention. Iggy and Dalembert are fantastic, fantastic players. Its not like Jefferson where everyone had their doubts; we had to reference back to his days on the Nets to remember when he played defense. Butler is having a miserable season, and Haywood isn't as good as posters make him out to be. Iggy and Dalembert are way, way better than those guys; they are surefire bets.
Some stats if you don't believe me:
Dalembert:
6.6 BLK% (one of the highest in the league. For comparison, Timmy's is 3.9)
21.6 TRB% (also one of the highest in the league. Would be the best on the Spurs, beating Blair and Duncan)
102 Defensive Rating (amazing DRtg, especially considering he is on the 9th worst defensive team in the league. That DRtg is better than everyone but Duncan and Blair and I'd expect it to e significantly on a better team)
84.3 FT%
Iguodala:
1.9 Steals per game, 2.5 Steal% (this only slightly encapsulates why Iggy is considered one of the better wing defenders in the league. One of the highest Steal%s in the league, and he doesn't do it on gambles but with really, really good hands.)
5.7 assists per game, 23.0 AST% (how amazing would it be to have a SF that could create for others?)
6.9 rebounds per game, 10.0 TRB% (one of the best wing rebounders in the league, probably only second to Lebron and maybe Melo.)
Length? Athleticism? Two of the best at their position. Health? Dalembert hasn't missed a game since the 2005-2006 season and Iggy has only missed 6 games in 6 seasons. Youth? Ages 28 (Dalembert) and 26 (Iggy), going into their primes.
How you would not do this deal if you are San Antonio I don't know. Philly does have a lot of incentive too; they need to dump those salaries. I don't really see whats wrong with committing to Iggy for 5 years of his prime. Having a Lebron-type for 5 years doesn't sound too bad to me.