I believe that Android will easily surpass Iphone. This is from a Global perspective and not just an US one. Granted that Iphone has a great hardware and software interface and Iphone lovers will only keep screaming copy cats but the fact of the matter lies that Android give the flexibility of devices. People get the flexibility of deciding what they want in a phone and are willing to trade off price for features. The second point is on openness. I am still amazed that the Iphone comes with a standard 3.5mm audio jack, knowing Apple they will want to customized everything. Sorry but lots of people are happier being able to use a standard USB cable for charging that costs about a dollar and use their nails to change the SIM card and not having to use a specialized pin to pop the SIM out.
The last point is Footprint, Apple have focused so much on development markets ( read USA / Europe) that they are barely present in developing and emerging markets. BRIC is where the numbers lie and if you don't have a value for money offering then you are just going to miss out
