Current services are based on technology that was developed in the 1970's - and the suppliers of equipment and services enjoy an effective monopoly. This does not make good reading. It should make most Airline Executives very unhappy. It makes sense to know where your aircraft are, if they are delayed and what operational or technical problems must be dealt with. Thus, it is an operational advantage for an airline to be in continuous communication with its fleet, to discover problems as they occur - and be able to respond, if required.
Civil aviation operates to International standards, which take many years to develop.
Aircraft equipment has to be certified and its installation and operation approved. Aircraft manufacturers are not keen to install any technology unless they see big market demand. Yet manufacturer support is essential. CAAs are also reluctant to move without industry-wide consensus. This is why Telecom operators have avoided Aviation Communications.