Riot, I think you are making a HUGE mistake (high elo solo queue)
If anyone hasn't read I'm referencing this post http://na.leagueoflegends.com/en/news/game-updates/features/dynamic-queue-and-future-league
In it, Riot is saying that they are removing the ability for Diamond+ players to queue as premade 4 or 5 players. I think this is a disaster. Competitive integrity was already greatly harmed by the removal of ranked 5s at the start of this season, but this change literally makes it impossible for would-be challenger teams to practice unless they have constantly available, equally skilled scrim partners.
League is a team game at high levels, not a solo game. You should be requiring Master+ players to join teams, not forcing them to fly solo. MMR does not work really well as a system for evaluating individual player skill, but it is fantastic at evaluating a team's skill.
This change will basically stratify the Challenger Scene, because if the current challenger teams don't scrim with new teams that form, the new teams will never get good practice. So while individual stars can join the challenger scene by getting challenger in solo queue, new teams will basically have no tools to practice.
The change removing 4 man and 5 man premades is what low elo players have been asking for, and it makes sense at our level since it is hard to coordinate 4 or 5 people to get on at the same time. But at master+ level, most players are basically full time gamers.
I just think this change will be super harmful to the future of the LCS/Challenger scene.