Who Will Defect to Sprint Because of New "Half Off" Offer?

This chart tells you why some analysts are queasy about Sprint's new half off offer for current subscribers of T-Mobile US, Verizon or AT&T mobile services. 

Some might note that the half-off offer had initially be restricted to consumers on AT&T and Verizon networks. 

The latest offer adds T-Mobile US. 

So some might argue that the likely impact will potentially be felt most by T-Mobile US, the reason being that customers of AT&T and Verizon who found the half-off offer compelling already would have taken advantage of the offer.