Hey hey,
One more idea to throw on the increasing pile -
Campaign playlists. So this one seems kinda obvious, there are a whole bunch of campaign missions which at the moment we're only seeing when playing the daily heroic but you know what? They're great fun! Particularly with a group of people.
So...
Why not create a campaign version of the strike playlists, with random modifiers (heroic, juggler, etc...) and, of course, rewards.
At the moment playing through the campaign on hard settings doesn't actually feel that rewarding when you finish because... no rewards. I know the fun is in the playing but you definitely feel disappointment with an empty reward screen at the end of a mission, it's a let down.
Campaign playlist would help to alleviate the monotony of the strikes for scratching that (non-raid based) co-op itch, whilst still helping you progress your character.
At any rate there you go, another suggestion :)
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Oh and with the random modifiers... So if they were to be tiered like the strike lists (ie; lvl22, 24, 26, 28 etc....) at lvl22 you have 1 random modifier, 24 gets 2 modifiers, 26 gets 3 etc.... Good way to increase challenge as well as making you change up your playstyle with each match which (for me anyway) makes playlists a whole lot more fun.