so what about the times where someone is autofilled, they just dodge and hope it lands on someone else. Thats quite unfair if you ask me.
Or the classic occasion of "My last Syndra fed, so I dont care if you main her, I dodge. He dodges and everyone loses time.
Another thing that surpises me: You want to dodge because of summoner names? Thats quite objective dont you think?
This would make also people say: "That guy 'If she 15 im 15' sounds morally wrong, I'll just dodge him because I dont think I want to play with such a guy.
You would basically make it easy to just stereotype players even more.
"Im gonna dodge all jax"
"Im gonna dodge all Teemo"
IF they ever were to add this feature, it would only be in normal game and maybe even only in blind pick.
Reason:
You got a ban, you can decided what to ban. You dont have to play against Teemo if you dont want to, but decision making is the point of the game.
If YOU decide to ban Teemo, you DON'T decide to ban Yasuo, It was your choice and you have to live with the chance of a Yasuo being in the enemy team.
Dodging a Game because you can't adapt to certain situations is not the right thing to do, and would be the opposite of a GOOD player.
A player should not be let off after dodging several games, because he wasnt 'prepared' for such a toxic enemy team, but he should be punished, just as it is currently the case.
Dodging is a possibility to prevent yourself once a day from loosing TOO much LP,
Yes you get a 3 lp punishment and have to wait 3-5 minutes
BUT you dont have to play with a Troll who might make you lose 18-25 LP and wasted you 30-60 minutes of time.
Think about it
If you are a good player, take risks and take chances,
If you dont face a teemo support, you wont ever learn how to deal with him.
TL:DR
Learning by DOING, not by DODGING
and let's not forget everyone favorite champs 
(even in his traditional roles)
or worst of all currently 