I actually don't think any of these are the main concern, Lyte. It's player behavior. That is by far the #1 reason for terrible ranked games. Your list would be a nice touch-up to the current system, but I think you Rioters should spend a lot of resources on finding ways to make it so that 90% of games don't end up with at least one person threatening to report someone. I don't actually think I'll get banned, but the lingering thought that I might, just because people threaten to report me for no apparent reason, is uncomfortable.
The environment in a typical ranked game is just disgusting (although it's getting slightly better at my current Elo); it usually begins at champ select, where people don't get to play the champ they want to or they're forced into a role they can't play well. I don't know that there necessarily needs to be harsher punishments in ranked, but there certainly has to be better and more tangible rewards for good behavior/play. It almost feels as if there's no punishment system considering how frequently games just turn into rage-/troll-fests. Just today I had someone intentionally announce that they'd AFK at around the 10-minute mark because another person on our team started arguing with him whether or not LoL used an Elo system. Yes, that actually happened, you can check my second to last game.
I'd really like to see some effort from Riot to control the quality of games by reducing the stress of the environment, rather than completely focusing on the numerical issues.
Also, I totally agree with this guy's idea ^ about normal Elo translating into starting ranked Elo; judging by some of my friends' normal W/L and their ranked W/L + Elo, there's a strong correlation.
I agree, player behavior is one of our most important problems. But, I am doing research on several things right now related to player behavior, and wanted to at least update the community about the matchmaking projects first.