37,000 towers - all 3G or better?

Hi,

   I have a question about

Network Evolution

Looking at Tmobile's coverage map, it's obvious that many of their towers have only 2G.

So, after the network modernization, will all towers be upgraded to 3G or LTE?

I know a bottleneck is the backhaul to a given tower but if Tmobile spends the money, they can get fiber to all their sites, instead of T1 lines.

I know Tmobile will cover 200million with LTE by the end of 2013 and that's good but that's not even all of the customers that it currently covers with HSPA+ (which is 225 million).

So will Tmobile upgrade all their towers to 3G or LTE?