How to make good support items

I've been giving a lot of thought to and what makes these items so problematic. The problem is that support items have become too focused on buffing and healing/shielding allies instead of buffing/healing/shielding the support. Supports are being picked base on what powerful active/passive their items grant the ADC instead of what they give the support. I suspect that even if we got nerfs for Ardent another item's passive/active will replace it because the focus is all on how to enhance the ADC. This is the cause of all the frustration for both support players and others that feel ADCs are too powerful.

Support items need to start making a move away from buffing and protecting the ADC (a little bit is okay but it's gone out of control) to buffing and enhancing the support. Powerful actives and passives are cool but when they overshadow the support's kit there is an issue and that is because the item's passive/active doesn't benefit the support very much compared to the ADC's benefit. I think a lot of power being granted to ADCs from the support items can be taken away in favor of buffing the support so that their kits can shine over the item.

Let's take an example:

Is the big problem child of support items at this time. It is an item that has a huge portion of it's cost in the passive that grants AS and damage on hit. This item is a prime example of a bad item for a support's kit but a grand item for an ADC to get buffed from. Instead of the current passive we could take that power granted to the ADC and give more the the support like so:

Unique Passive: Whenever you heal or shield an ally your next ability does bonus X magic damage and refunds 5% of the current CDs on your abilities for each enemy champion hit.

Let's analyze this new passive. It grants power only to the support but only if their heal/shield their allies so it can't be abused in lane easily. It would be a wonderful item for enchanters as it makes them have to be aggressive to proc the damage and get the CDR so they become more engaged in combat. It isn't granting insane power to the ADC anymore so the item doesn't have to be balanced around how it effects another role. It enhances the enchanter's kit and not really anyone else. It would allow the entire kit of an enchanter to shine and not just their shields and heals. In short, it makes the champion better and is not just an OP OMG active/passive that ADC needs.

To sum up. We need more focus on buffing supports through items and not buffing ADCs. A good support item focuses on the support and not others. I would love to hear other's thoughts on this so pop in and lets talk it out. How do you think other items could be changed to buff the support more and not the ADC? How about Knight's Vow, Redemption or Locket? I have some ideas but I want to hear other's thoughts.