I have told the story here before, but here it is for those who might have missed it:
I was out boating on Lake Mojave last summer pretty far away from services, and without phone coverage. Came across a boat with a medical emergency. Couldn't hail anyone on Marine Radio. Couldn't find anyone on GMRS. Jumped on a couple local-ish analog ham repeaters and nobody was listening. Jumped on a DMR repeater, tuned to one of the talkgroups (don't remember if it was California or Socal) and got an immediate response from dozens of hams. I could have gotten on any talkgroup from very local to worldwide, and I GUARANTEE somebody would be listening and could offer assistance. Somewhere in the world, somebody is listening. With a local analog repeater, if nobody is listening, nobody is listening.
And that is the great thing about DMR networks. The local repeaters might be dead, have nobody willing to help, nobody listening, etc. But if you get on one of the large DMR talkgroups, you immediately have a HUGE audience, and can be almost guaranteed that there is at least somebody willing to help.
The idea of a 911 talkgroup is great, but then again, you have to have dedicated people there listening.