I'm in the PLB business and I can say probably not anytime soon. The PLB market for boaters, hikers, etc. is LARGE. For divers, the market is very small compared to the former.
Yet Mike Lever has been able to establish a company creating what amounts to a range limited VHF radio for divers? The lifeline isn't going to bring the cavalry in a worst case scenario, my PLB does what it can't.