I don't think this system works, even though I'm not level 30 and haven't played ranked games, I can say that I've won many games where my team got less kills and/or assists than them, so that means that killing, dying or assisting is not an indicator about how well you did. Yesterday, I had an enemy Kog'maw, the ******* had above 20 kills at around 20 minutes while none of us had not even 10, he would kill any of us in like 3 or 4 hits (I was Mundo and not even my ult could save me), still we won, they didn't get any of our base turrets, the rest of them weren't bad, we just played as a team, pushed, pushed and won, didn't even need a baron, that begs the question...Did that Kog really played that well??? Did he really deserve a reward??? Maybe not because he was never close to win the game, which is the whole point.
Also, I don't agree with the whole turret thing, even though you have to take down turrets if you want to win, you don't need to take them all down, you perfectly could just make your way through one lane into their base and win and leave the rest of the turrets to rot with full health.
Even though in your proposal you consider having a cap, let's say you're ready to win the game but one or more of your teammates haven't reached the cap yet, what would stop them to forget about winning for a while and wait to kill more enemies or go take down the remaining turrets so the whole team gets max elo points, and yes, you may be risking the win, you may stupidly lose or you can win anyway, in any case, you're lengthening the game unnecessarily because you didn't do what you were supposed to do which is just go and win it.
The thing is, is not the actual system that is flawed, is the people, whining, trolling, being as5holes... and there's not much Riot can do about that.
I like the idea however I still think the support is at a disadvantage if on the losing team because they will not get as many assists because there team arnt getting as many kills and still sacrificing themselves for others, also the build tankyer if your getting insta gibed as a support on the losing team is difficult to do because you are still getting very little gold, having to buy wards, and hopefully helping the team with auras makeing additional health items harder to get. To make support less of a elo handycap I would sugest a small amount of elo for healing and or shields, and to help those initiators on the lossing team (not nessicarally there fault for not having a team who can back them up when they initiate) I think a little bit of elo for damage taken could help even that out. However with both suggestions I think it would be a hard amount to get right so that people wouldnt abuse it buy still help those for whom it is intended
just my 2 cents
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