I think it would be a poor choice w/ the incompatible networks. Part (not all) of Sprint's problems are related to their purchase of Nextel (iDen) network that is not compatible w/ the the Sprint (CDMA) network. While Sprint did (and still does) sell dual mode devices, most consumers w/ Nextel kept their plans active on the iDen network. I am not suggesting that a T-mobile/Sprint merger will never happen, I just think it would be a mistake if it did happen.
Do anyone know if T-Mobile will merge with Sprint? I was looking around the net and come across some rumors of T-Mobile thinking to merge over. Bring your thoughts about this.