There is no way Martin, at 28yrs old coming off his best season, is in decline. If anything he just entered his prime. Same with Nene. Scola is also coming off the best season of his career, and likely has at least a year left in his prime.
And now an excerpt from the future, David Stern Memoirs (2015) On the Chris Paul trade: "I was really trying to help out the Rockets. They are one of the NBA's most storied franchises and as much as I was tired of catering to player's whims, I knew I had to do whatever it took to get Samuel Dalembert and Luis Scola on the same team. It was fully in the interest of the league. Needless to say, Mark Cuban and Dan Gilbert were not happy."
