If the "limited number" of precision users means anyone with a WAAS receiver, that is slated to be every airplane in the US by 2020, which is when ADS-B is slated to be mandatory, and ADS-B needs WAAS for accurate position information.
It's already my airplane, with a 2005 vintage WAAS CNX80 and a 1090ES transponder, and it's a whole bunch of Garmin 430W and 530W's, not to mention the newest Garmins.
LightSquared should never have been allowed to proceed as far as they did. Somebody at the FCC must have been aware of their plans and intent, and certainly should have taken notice of the fact that there was a strong possibility of unintended consequences.
Every day more and more flight crews report interference with their navigation and control systems from personal electronic devices, all of which use far less transmitting power and emanate far less in the way of potential electromagnetic interference. If a cell phone or a laptop is capable of causing problems, then any fool should have been able to predict a serious incompatibility in allowing 40,000 high-powered stations to be set up across the nation. One can only draw the conclusion that the aforementioned "fool" is a political appointee.
The United States has the highest safety record and the greatest number of quality NAVAIDS of any nation. Why would we want to degrade that even a little?