To be honest with you, they do have a problem with it. A big problem.
1.) They have profit problems, unfortunately, the usa model makes more profit, which is why we have have wimax and lte launching now, and most of Europe is trying to figure out what bandwidth and who pays for it.
2.) Security. GSM is about as secure as macs are. They run around saying that it is 100% safe, but is always hacked. It takes about 200 dollars with of equipment and, it is humored, people can clone your sim from 400 feet away. then can use your connection for anything they want to. Who are they going to arrest, them or you?
3.) Anonymity. GSM allows people to make calls from anywhere, using any device. This creates a problem with governments and police. Sept 11th, mumbai, and the dozen or so terrorist attack that happen daily, happen because of the anonymity of gsm, simed phones. Tracking, tracing, and shutting terror networks require one account, one phone system.
4.) Speed. GSM is incredibility efficient at delivering data.
5.) Interference. GSM is susceptible to heavy interference. CDMA, WIFI, bluetooth, wimax, lte, RF, IR, power cables, and even satellite interfere with gsm. Which is why att has the same number of towers of verizon, in any given area, there is less reception.
GSM as a technology is going to be reduced in size because of limitation of it and do to terrorist sim cards are going to have to be replaced to.