Even though there is no clearer evidence to prove this, Michel hasn't been given the respect he deserves lately. Ubisoft has completely gotten up their heads with the Canadian studios way rather than the original French ones.
Going with the eternal salt-on-wounds law: "Whoever has the gold, has the rules."
But following the rumors, it seems that he is going solo as well starting his own studio, which could actually be a very good thing!
The BEST scenario I could imagine is that Michel ends taking the franchise with him, but I highly doubt that could happen at all, Ubisoft making all those teasing/useless cameos of Jade in their recent games.
This have been dark times.