Any intention to promote support/fill in ranked?
https://www.youtube.com/watch?v=xwPa1SGLGv0 After watching the recent video discussion about Qynamic queue, I feel that they didn't talk about an important issue that contributes to the shitty timers and matchmaking quality. Having all 5 roles filled more evenly will make the matchmaking and queue times a lot better.
They talked about 'popular roles' (mid) and 'less popular roles' (support), but they didn't talk at all about why those roles are not as popular and how they could be made more attractive. Secondly, there is currently no reason to pick 'fill' in ranked, because it puts you at a competitive disadvantage as you can't be evenly skilled in 5 roles as someone else is in their best 2 roles. More people picking 'fill' would mean a faster match making.
Support
Support is obviously where the big lack is. If you pick 'fill', you'll be getting support very often. It's probably very hard to make this role more attractive due to the nature of the role being dependant on your team. However, it might be worth considering creating a new 'big plays' support to help make it more popular. I don't have the statistics, but from my experience, support role became a lot more popular after Thresh's release. This champion, even though average at performance, is still the most popular support. People like him because you can make plays. There are people who pick support because they want to passively assist their team, like soraka or janna (which also take a lot of skill, but aren't very flashy or interactive with the opponent), but a big part of the community prefers champions that interact with the opponent. They want to land skill shots, dodge abilities, kite, faceroll their keyboard, 1v5 (not gonna happen as support).
I think that a support with a dash, a spell shield (sivir) that heals your allies upon soaking an ability and a skill shot as basic abilities would make for a pretty cool support concept. You can add the rest to make it a balanced support, but I would certainly love to play a champion that could soak things for my team, while being mobile and deal some damage, but without the permanent tankiness like Braum. Braum is actually pretty close to what I suggested here, but he's slow and generally clumpsy to play as. In addition, he's just permanently tanky and while his shield makes his even more tanky, it's not that spectacular. Actually, there's still no support at all that has a non-targetted dash. People like to play champs with flash/dash (zed, lucian, kindred, azir), but support only has Braum who has a clumpsy low ranged allied-targeted dash and a few champions with enemy targeting dashes, but no free-style dashes.
Fill Filling is currently horrible. Riot basically forces you to pick 2 roles and commit to them if your dream is to climb as high as possible. While picking a main role was already a strong strategy in climbing in the past, you still had to be decent at all roles (unless you want to queue dodge). Now, I don't want to force others to play all 5 roles, but for me, league has always been the most enjoyable when I have a variation in roles. In soloQ, I would let my team pick their roles, usually calling 'pref top' because I mained wukong, but open to play any other role if someone else mained top as well. Right now, this flexibility is a lost perk. It doesn't matter how good you are at all roles if you can only pick 2. While I would definitely love to pick fill, I feel like I'd just make my own performance less consistent without getting anything in return (and no I don't care about a shorter queue time in ranked while trying to get back to diamond).
Having people pick more than 2 roles would benefit everyone. I think that aside from fill, there should be the option to pick a tertiary and quaternary role. In addition, I think that the matchmaking should adjust for the amount of roles you're playing and have your MMR rewards adjusted accordingly, so that it's fair for everyone (this will need vigilance and fine-tuning).
Another reason why fill is unpopular is because you're almost guaranteed to get support, so you might as well pick support. However, if the issues addressed above get fixed, this one should automatically be fixed because more people picking support and more people picking fill will leave some breathing space for the 'fill' population.