Might be worth waiting to see what's actually available. A universal service that doesn't require an internet connection could certainly have its uses. Not least for emergency notifications: the SMS-C infrastructure is about as reliable as anything we've got.
I'm sure we all have several different clients to talk to different people. For me it's Signal, Hangouts and Viber. I've had problems receiving SMS in England with Signal, sending SMS to US numbers (but still cheaper when you're in the States than any kind of data plan) which you need for the other services.
As for the ability to tap into the service – well that's no different than what's already the case. Want something secure: don't use a public network.