Earlier quoted context omitted.
IIRC that is the original goal of beeper, to act as a universal messenger front end
So the end result will be dozens of 'universal' 'standards'?
Since the old and proprietary protocols are only sustained by the network effect, they lose users, and eventually support for them gets dropped.
It's a method of transitioning from a collection of proprietary systems with their own network effects to an open one, by temporarily supporting both. For obvious reasons the operators of the proprietary systems don't want to be subject to that competition, which is they same reason they shouldn't be allowed to shut it out.