I would be really interested to try an iteration of mythic+ where the group composition is 1/1/4. 6 player dungeons.
There are so many buffs now and so many classes wanted for a specific thing in every group that I think it wouls be cool to experimwnt with 6 player parties instead of 6.
Maybe even look at making new support specs for a few existing classes and creat 1/1/1/3 compositions with that 3rd role being support. Im not saying its a good idea, and maybe it will suck, but what could experimenting with the ideas hurt?