Lebron James had his own reasons saying the league was "watered down". He also said the league would gain quality and become more competitive if there were less teams with more quality players.
On the other hand, the NBA has recently put a lot of effort into expanding and becoming known worldwide. They have done things like holding exhibition games in Europe. This is one reason the population of foreign players has significantly risen in the last decade.
Lebron's idea is something to consider though. Possibly one of the the most memorable and loved team was the Chicago Bulls in the 90's, winning three straight NBA titles then another four straight. The bulls had many all-star players including Michael Jordan, Scottie Pippen, Horace Grant and B.J. Armstrong. This also came at a time when there were roughly 28 teams in the league and attendance was booming.
There are now currently 30 teams in the NBA. Some teams struggle to fill their stadiums on a week to week basis. Lebron's reason and idea is one that has proven to work in the past and could possibly help the NBA's attendance and increase the competition players see throughout the weeks.
