Yes, it is a superstar driven league. But superstars with no role players won't win a championship. Gasol and his $19 mill salary has a trade kicker, so he can't be traded to get Dwight. Kobe will be making $30mill in a $58 mill cap year. Even if you gut the rest of the roster and trade Odom/Bynum for Dwight, you end up way over the tax threshold with a roster of 5.
Now you need to sign role players with just the MLE and LLE at vet minimum contracts. Might be able to pull it off in 2012-2013 for one last hoorah, but the next season starts the $3.5 to $1 tax for team who are more than $15 million past the $70 mill threshold, which the Lakers will be. Buss will s out over $200 million with taxes in 2013-2014 ALONE.
It's not the NFL, so you can't just cut your overpaid guys to get under the threshold, so you're stuck.