I think this is an extremely important point to raise, to help MCC’s success. Bungie’s playlists were excellent 10 years ago and some of these playlists you 343i have created were also decent. Now is the time for change to keep the audience playing MCC. We need new fun and experimental playlists; whilst keeping the classic competitive ones, let your imagine expand and be open to new ideas. Maybe even new competitive ones. Create a revolution. I guarantee some of us are getting sick of the same games over and over again, for around 5 years. This update was postponed for many years and promised to fix the game. But can we bring something new to the table?
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I will begin by suggesting an example. Disabling a radar on a more modern game like Halo 3 and forcing players to use sound to guide there victories. Maybe also increasing the active camouflages in the map, where stealth and map placement is an important priority. Do you guys have any ideas, go crazy!
I think the problem is the MCC has too many playlists, the population has fallen since the update and the remaining player are spread across many playlists, the population is not big enough to support new playlists without removing others imo.
With the launch of the Match Composer, social playlists will most likely become a thing of the past. If they were to add some new experimental modes, they would most probably add them as selections within the Match Composer. 
One idea I have is a mode with faster base movement speed. That could be fun for social slayer.
Wait for the composer update, I know it will be great for searching specifically matches.