MM for normal mode, no MM for hard mode, the casuals get to experience the entire story of the game they purchased, and if you feel like you want to be a try hard elitist, just change to HM and pick up a fireteam on /r/fireteams, the 100, or w/e "social gathering" site you want to use. Move raid challenges to HM also, that way the try hard elitist can have something special to keep them busy and forget that MM is in normal mode.
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I want MM it's not the players that are stopping it. It's Bungie. If they added matchmaking the completion rate for the raids would skyrocket and it wouldn't seem as hard. If you remember right after VoG came out they said it would be impossible for a group of random's to do it. That only "battle hardened teams" would stand a chance. It's all so the programmers at Bungie can feel better about themselves.