The support/fill issue isn't about lack of fun supports, itemization or balance
This game's objective is to kill the enemy nexus. Along the way you are acknowledged in your success of 'mini objectives' that help you kill the enemy nexus. These include: minion farming, killing dragons/barons/herald, taking towers, and killing enemy champions.
the 'Support' role plays an integral role in ALL of these... with absolutely NO reward from the GAME CLIENT.
ADC gets a pentakill after you facetank 3 skillshots, peel effectively, and eventually sacrifice yourself to prevent their death. No recognition.
You place wards in the enemy jungle around dragon and use your vision to successfully cc/stall the enemy while your team takes it? Nothing.
Support ends the game 0/0/20 Never once did he get acknowledged with a kill streak, bonus gold, or in game announcement. WHy aren't supports godlike after a streak of assists?
Use shields effectively to prevent teammate death? Not even listed in post game stats.
YOUR GAME ITSELF does NOT promote the support role. This has been ongoing since inception.
FIX THIS. And supports will queue up.