What do you propose that would be so much better than RADIO, that it not only supplants radio as a primary form of communication, but actually removes all traces of the use of RF energy?
Texting while operating a starship could result in a most disastrous accident.
That's a loaded question! Considering the method for communication could be something mankind is not familiar with, the possibilities could be endless!
Unfortunately, some recent studies have indicated that signals may not reach nearly as far in space as they once thought. The whole idea of signals going on forever seems much less likely today. Which isn't a big surprise when you really think about it.
While the possibilities are endless, the probabilities can be evaluated.
Only if you discount our understanding of physics, or
discount the stability of the laws of physics.
But again you're limiting your thoughts to "our" understanding of our world and our lives.
Based on the laws of Physics.
Those laws do not change with "understandings".
So you're close minded to the possibility that an alien life form could exist and function in a totally different way then you're familiar with? Think outside the box. An alien life form might be in the form of a liquid, gas, or maybe in an element not yet discovered by man.
Link?
Radio propagation is well understood, and well proven by our deep space probes to date.