Who's to say they didn't try to bribe the chip makers, but didn't have enough money or the chip makers told them its not possible in such a small package.
Regardless, its true, its too late now. But one day, one manufacturer will create a future proof phone. One that can utilize the phones bottom connector and have different radio modules that can attach to the device so that you can plug and play sort of with any carrier, any where. The phone will still be a high power, top of the line device except no radios only wifi. You want to use it on Sprint, attached the Sprint radio module, want to use it on Verizon, get the Verizon Radio module, etc etc.
TS out