The percentage of electronics at the end of their lives which were recycled.
The EPA found that the percentage remained consistent from 1999-2005. Even as recycling rates went up, the amount of electronics reaching end of life outpaced the increase, leaving the figure static. (source: EPA, July 2008)
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This has been AT&T's plan for a long time now. There is nothing wrong with Femtocells, in comparison to nothing, but there is a simple -- and in my view, better -- alternative: dual-mode cellular/WiFi, such as the UMA standard deployed by T-Mobile USA, Rogers and Orange, among others. The key thing to understand is that there is nothing mutually exclusive between deploying dual-mode WiFi/cellular, and Femtocells. In other words, AT&T could at any point simply copy T-Mobile USA's approach, and then also do Femtocells at any time. Given that dual-mode WiFi/cellular using the UMA standard have been available for well over two years now, it is field-proven with millions of subscribers, and that Femtocells are not yet mass-deployed, one would think that AT&T ought to deploy dual-mode cellular/WiFi UMA as soon as possible (ideally starting over two years ago already).
The path you suggest would limit the “take rate” of such a product/service. Remember, not all devices (cell phones) are WiFi enabled (last estimate was somewhere around 18%). So why spend resources on such a limited approach? A mini BSC (FEMTOCELL) is absolutely the right approach since it will be most likely compatible with 100% of their (AT&T’s) 3G devices. The only thing left to do is “GET’ER DONE”!