Yes the technology has been around for more than a decade and so has now been through several stages and well road tested.
The advantage for the roadside assist companies is that they are operating in only one country . . . It is the Eurocontrol that has to change and become a TRUE European control.
However, since some states are still clinging to the wreckage of their airlines (Italy) and many others have misplaced misunderstanding of Europe (UK), we are going to have to wait for more consolidation of carriers.
Had AF/KLM picked up AZ then it would have been a starting point. All of this will happen, it's only a question of when.
(Thanks Glf, my work pattern has changed now and I only use LTN for domestic, such as IOM this Friday)