Would kind of like to see Softbank merge up Sprint and T-Mobile US (if it could be purchased), to give them even greater scale to put serious competitive pressure on AT&T / VZ. Softbank is good at attacking entrenched markets, the more market leverage they have the better.
That could be a short term challenge since Sprint is all CDMA and T-Mo is all GSM. Wouldn't have any short term benefits, but the long term could be big.