I am the amateur radio frequency coordinator for the Indiana Repeater Association. Over the past two years or so, the number of DMR repeaters has increased dramatically in Indiana and the number of D-Star repeaters has decreased. So, it's my opinion based on Indiana repeater coordinations for the two modes.
Oh, and don't get the idea that I'm a big proponent of DMR for amateur radio. I'm not. I don't own a DMR radio, nor do I own a DMR repeater.
Nonetheless, if the OP thinks that the IC-7100 will suit his needs, whether it has D-Star or not, he's still looking for validation of the review comments he's read on-line.
With all due respect, your Indiana repeater theory is not proof of DMR killing D-Star. The vast majority of D-Star users are forgoing the traditional repeater in lieu of Dongles, DVAPs and other access points. Having that capability both home and mobile allows the HAM to use D-Star liberally and at will without competing for repeater access. That's my theory... And BTW, D-Star repeaters vastly outnumber DMR nationwide and continue to grow according to data presented by the Georgia D-Star group at Hamvention 2016.
The 7100 is a fine radio (which I want) and there is a great video walk-thru of features of the radio on AmateurLogic TV.
73
Mark