Point Of Clarification
For general info. I met with Microgaming at ICE and they explained that Grand Prive have the Beta of the new MG affiliate backend which carries the “one wallet” (single sign-on) solution. This will be rolled out and I believe that Miles meant, when saying “lots more MGS will go this way” he means that they will get the affiliate system.
Additionally, MG clarified that “single sign-on” does not mean affiliate tags are dropped when players cross over to different casinos by default.
So, while GP may or may not choose to drop tags, the default in the new MG aff system does not. It would be the decision of a casino group if they follows this path.