The submmo genre is really big these days with the Division having strong initial sales and Destiny obviously being a giant. Anthem is on it's way delivering a similar format, and with many players feeling uninterested with the Halo formula I can see them taking a similar approach, kind of blending the PVP style of Halo with a (hopefully) better version of the Destiny PvE. Halo 5 had Warfront bosses and they were pretty fun if simple.
So, It is something I could see happening and I was wondering what you guys would think if they announced Halo 6 and it took this new approach.