A cultural change where simply winning the game is more appreciated than personally carrying the game. Not gonna happen.
Seriously, people want to climb and get the skin, get the border, get the bragging rights. They get excited by the damage and control they have over a match. You might say supports have control in a match, I(support main) heartily disagree: We have control of a fight, not uncommon to have some control over who lives and dies even. However, in a full match, I can't go places without my team. I can't engage without followup. I can't take a tower, push a wave, take a dragon, and so often can't even do my biggest job, warding, without a buddy. Very few people enjoy this loss of agency, and even more are deeply frustrated when their team ignores the right option for farming wolves, and the support has no capacity to do it him or herself instead.
What's more, if someone on my team has to die, almost every time it's the support that should go first. Even the LCS casters say the same: "....it's 1 for 1, but it was mid for support. (team that lost their mid) is going to have to pull back for a bit...." Almost nobody has that self sacrificial flair. We get no gold, one to four item slots taken by lower impact items, to include the necessary yet anemic sightstone, and so often get ourselves killed over it to hear "nice double kill, lucian!"
So Riot has given us playmaking supports
, impactful items
, and what happens? the champs are taken top and jungle until they're nerfed into obscurity, the items are taken by mids and jungles until they're made worthless again, and our lack of damage and kill scores keeps the average* league player laughing at the support.
*remember, the 50% mark on the ranked ladder is about silver 4 at the end of a season, and that's JUST when supports start seeing meaningful recognition by anyone else. It's likely the same or worse in normals, but I play a lot less of those.
But how can based Rito help us? well, announcing assist streaks is a start. Even with no text on the screen, an announcement of "Provengreil has Assisted 15 Kills" would help people realize that I do things. it might be rough to code, but a stat for enemies warded would be amazing. Might be tough to keep some people from stealing it
, but once per team merging sightstone with boots instead of denying us powerful support items to save a slot would be incredible.
In the end though, its up to not Riot, but we the players to simply credit the supports more. recognizing the supports as more than just "ward biatch" or sacrifice would massively improve some people's willingness to play. I think it's just something non-supports will have to live with until that time, which may well never come.
until then, I, Provengreil, Will support you if you carry me.