I kind of wish we would just use a more secure cellular protocol to begin with. And I know that's a lot to ask for, but can't we just have nice things?
Encrypted content over the cellular protocol seems more plausible than a secure protocol, given that a) it's a feature that phones can roam across networks and b) the way these "exploits" work is for LE to emulate an endpoint in a system whose principles actively collaborate with LE (to some degree under force of law).