I agree with you on principle, but it can and will be abused if modified the way you describe.
Here's what's gonna happen - teams will have a sacrificial leaver. They'll give up a kill, the usual push to FF all the things starts, and one guy quits. The entire team dodges a deserved loss. (And this is sorta what happens with remake - you can't do it after there's been a death)
Matchmaking is already a bit ridiculous, but this would lead to insane rank inflation.
(crazy idea reposted to its own thread: https://boards.na.leagueoflegends.com/en/c/player-behavior-moderation/Hm8JQt0E-what-if-you-werent-up-a-creek-when-someone-left-your-ranked-match)
Here's a better idea. What if we had a vote when someone disappears and isn't coming back?
- Someone leaves and gets 3 minutes to reconnect.
- If they fail to do so, everyone on the shorted team gets a popup (kinda like the surrender window). They're voting on staying or leaving.
- If majority votes to stay, they're locked into the game and proceed as usual. Someone who doesn't vote is considered to have vote "stay".
- if majority votes to go, their nexus pops and they lose instantly.
This puts some control back in the hands of the shorted team and lets them make a tactical decision. They can't be held hostage by a leaver, they can't really abuse this all that much.
So far, all I've described is an automatic surrender vote. Now here's where the magic happens: What if we factored LP/MMR calculation into this as well? What if we recognized that winning or losing a game when the teams are imbalanced should be recognized?
In short - you win and lose (team imbalance * 20%) more or less.
If one person leaves:
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If they vote to stay, and the shorted team wins:
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They gain 20% (or one-fifth) **more **LP and MMR than usual. Carrying a team down a person is not a small achievement, and this serves as a small incentive to play the game out.
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The losing team loses 20% more LP and MMR than usual. Losing against a team you're up a man on should also be reflected.
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If they vote to stay, and the shorted team loses:
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They lose 20% less LP and MMR than usual. Being down a guy statistically ruins games and means the match result isn't as much a reflection of skill as it should be.
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The winning team gets 20% less LP and MMR than usual. Winning against a team down a guy requires less skill.
Now, what happens if they vote to go?
- They lose LP as they normally would for a loss.
- Their MMR is not impacted. Again, deciding you don't want to play a game when you're short a person at a bad time should not be held against your skill rating. The loss of LP (and the threat of demotion) is the incentive to not bail out of games frivolously or have sacrificial leavers, and the result shouldn't be held against your skill. Bailing out when you're down a guy means that your next game should be of equal difficulty, because in a way, you got screwed.