View it he http://videoontheweb.faa.gov/aviatio...stry/ADS-B.asx

Initially, airlines will be exempt from ADS-B mandate (there is no
plan to implement ADS-B for military aircraft, so they will remain
largely invisible); General Aviation will be required to pay for ADS-B
first. There are 219,780 general aviation aircraft (66 percent of
them piston-engine singles). There are 19,382 air carrier aircraft, or
about 11% of the GA fleet. So, although the FAA wants to employ ADS-B
to track airline movements in the air (especially in areas lacking
radar coverage), and more importantly, on the ground, they are
proposing to demand that GA aircraft owners spend thousands of dollars
for ADS-B equipment and installation. Is that reasonable? Why?

So, if the current ADS-B OUT NPRM is enacted, GA will have to install
219,780 ADS-B units, and receive none of the ADS-B IN benefits such as
traffic depiction and weather information. The sole advantage will be
ATC's positional information of GA aircraft in areas lacking radar
coverage, and on the ground. If a private corporation were to attempt
to market a product with such an unfavorable price/performance ratio,
it would fail miserably, but the heavy hand of the Bush administration
knows no bounds.

Additional persuasive FAA NextGen ATC propaganda he
http://www.faa.gov/regulations_polic...authorization/


Disclaimer: These are my opinions based on my understanding at this
time. Factual and informative rebuttal is welcome.