All of the "solutions" to getting people support
Are rarely solutions. They are usually things that will either break the game for other champions (overly cost efficient support items that will be abusable), changing the support role completely(turning off old support mains), or are not even solutions at all.
The bottom line is people don't want to be support. This is in every game. People don't want to be the healer in MMOs, people don't want to be the peelbot in MOBAs, and people don't want to have to support the team. No matter how important the support is, people don't want to be the support. They want to be the DPS, the hard engage, the tank, someone who proactively does something, rather than re-actively assist the team.