Dealing with Redemption + Locket and increasing support item diversity
So Riot's finally starting to look into Redemption and Locket, right? These two items have gotten to the point of dominating the support meta-game. Not only are they strong on their own, but they also synergize with each other and offer a 2-fold aoe defense your support can buy for 4.4k gold. As much as other support items need to generally be better, it's no lie that these items need to be made worse...especially when used in conjunction of each other.
What I suggest is to make it so that the items have dyssynergy when used together. Make it so that using Locket reduces the potency of Redemption, and vice versa. This would make it so that if you need shields against burst, you go Locket, and if you need sustain for sieges, it's better to go Redemption, but it's not optimal to just stack aoe defenses. The point of a move like this would be so that one would choose the best fit for the match at hand, rather than just slap 'em both together every game and be perfectly fine.