I love to play support, but the problem when you play this role is that you can't defend a turret alone or even temporize the time that your team re-spawn. If the support is the only team member alive at one point, the support can't even defend a turret against a big wave of minion! Again, this highlights the fact that people are reluctant to play support.
I remember a time (not so far away) when there was a summoner spell that strengthened turrets and increased the damage for a few seconds (kinda). Why not making a new item based on that spell for those playing support?! :)