@MEDDLER, Regarding the ongoing internal Support discussion at Riot
Out of the available Summoner Spells, Barrier is the only one sitting unused because all other have use cases and are fairly common on Summoner's Rift. So why not buff Barrier to make it more appealing to duo lanes?
#CURRENT HEAL
Heals the caster and the target nearest to the cursor (prioritizes the most wounded allied champion if no allied champions are near the cursor) for 90 - 345 (based on level) health, also increasing both targets' movement speed by 30% for 1 second.
#NEW BARRIER
Shields the caster and the target nearest to the cursor (prioritizes the most wounded allied champion if no allied champions are near the cursor) for 115 - 455 (based on the level) for 2 seconds.
(You can also apply that debuff that prevents multiple Barriers stacking fully with themselves, just like Heal has).
As a support main from mid Season 4, i am generally only left with two choices - Ignite or Exhaust. Ignite is for kill lanes that can get off from an early kill while Exhaust is more to mitigate the damage and used in passive lanes. You can't pick selfish Summoner Spells as you're there to help your Marksman, your life isn't exactly worth without them. Barrier seems like a good candidate to promote as it may be used as a short term solution to block burst damage and not to stack shields with existing shields from items or abilities. Since it scales with the level of the champion who has it, it won't reach high values as it would for solo laners so i don't believe there would be any issues with getting out of hand too fast.
This is just my proposition and i welcome the discussion, if people have something else to contribute. [slayer-jinx-wink]