The idea of 30 years is a long time in the basketball world. This generally spans the length of two or three full careers of NBA players, as most players generally last for about 10 to 15 years in the league. With that said, looking at a 30 year window on NBA franchises gives us an opportunity to see which teams have most successfully rebuilt themselves from the ground up, each time the old has gone out and the new has come in. Let's look at three of the more successful NBA franchises during…