Why should we ask you questions, do you work for Accor?
By the way, I cannot think of an MGallery that would deserve a demotion to Mercure, at least until quite many Mercures I can think of are demoted themselves. I can think of a few random ones that should rather be Sofitels or Pullmans but apparently there were properties with brand exclusivity in town.
MGallery is perhaps my favourite Accor brand and I hoped it would not be tampered with. I wouldn't be caught dead with a Mercure franchise had I run a decent boutique hotel, but joining the MGallery club would be enticing.
I think Accor might be running into the same issue as American big chains are - too many upscale chains, and nobody can tell the difference between all of them, so they start to be meaningless. Sofitel already has three sub-brands, weirdly only one of them Accor calls "luxury" - wouldn't it be time to curate the Sofitel brand more (and perhaps demote some properties) rather than spread it even more thinly?