We Need Replays
Honestly, I don't see the excuse anymore.
Imagine getting done with an awesome game, click the big share-match button, and instead of being brought to an unexciting page full of KDA, CS and gold-leads per minute, you go to the in-client replay system and can see the highlight time-stamps for plays that your friend was in. Then there woudl actually be a point to sharing a match with someone.