This topic has been discussed so many times yet. If there is a kick vote, it will kill diversity. Personally, I've started playing support Poppy recently, and let me tell you what, I get flamed way more often than I get trusted. Yet, the pick is still very viable. Spamhappy/Zekent played quite a bit of support Poppy games and ended up positive, and "Opened" is currently on a mostly-Poppy streak (/Opened97 on twitch), and he's playing it to great success too.
But overall, I'm pretty sure I would get kicked from playing Support Poppy (or J4/Morg) and they are truly viable, and even more so in Silver Division... It's the same with Karma top, people play it at all levels of competition yet, since it's not mainstream (aka played by Dyrus or Voyboy), I'm getting flamed for it.
Just remember every sinle times you saw someone get flamed in champ select, that would've been a re-queue and a possible penalty for someone that was either trying something out, or maybe even playing to great success something you don't know works.
Also, I don't see how kicking someone handicaps you less than him being AFK.