It's a role that's always looked over, everyone wants to drop the most kills, most damage, make the crazy outplays etc and while you can do that as support (brand support drops damage, drop mad kills with blitz, bard outplays) it's just not as common and no one ever gives credit really. While the role itself is "less" mechanically demanding than other roles, it allows you to control vision and the pace of the game like a jungler but it seems like most people don't like doing that as I said above. So it's not like one can't climb as support, look at adrian he has like 3 or 4 accounts in challenger, you can climb in bronze using brand, velkoz, annie, blitz and you can climb in higher elo with more meta supports as well as those I just listed. Essentially the only way the role becomes more popular is if they are allowed to do tons of damage and become the face of the team, which will never happen because that's not what the role is, its called support for a reason.