I have an Rank System Idea!
What if they did a Division/Teir Rank Reset! Example: If you are in gold, Riot can reset all gold gamers to G5. Then in your placements you only play gold gamers to see if you stay in gold or move up to Platinum or down to silver. This way its a Fair rank system where you start over fresh but have the chance to battle gamers in the same division/teir and possibly move up a teir after your 10 placement games.
Bronze gamers will be rest to a clean slate in bronze. Everybody will be B5 Then after placements you can be placed in silver if you do well.