I suppose shortwave radio signals will always "exist". As long as there is air, free from any roadblocks, and someone transmits them, the radio waves will reach our receivers..... but the days of secular broadcast shortwave radio are numbered - and the end is near. Although there are still areas of the world where local broadcasts remain the only link to vast numbers of the population, International shortwave broadcasts are no longer a viable way to reach the world audience. The internet has forever changed the way the world disseminates information.
Denial is futile.
The "cell phone radio" has replaced the relevance of Ham radio.
The automobile replaced the horse........etc etc etc.
The internet is at war with broadcast radio and it has won the battle with International shortwave.
The internet and whatever it might evolve into is here to stay.
In the end, youth in all it's exuberant forms overtakes us all.
Say goodnight Gracie.