@Riot/Meddler: Thoughts on AP Item Efficiency?

Patch 5.22 saw the introduction of price increases for a large number of AP Items, due to the facts that both ambient gold generation was increased, and AP as a stat was seen as simply better in terms of gold efficiency when compared to AD items. Its been a little bit more than two patches now, and I was starting to wonder what data had been found regarding how this change has affected AP based champions.

Without the sheer number of games Riot has to draw data from, I am limited to my own experiences and what I have read on the boards / reddit regarding the experiences of others. The most prominent things I've seen is the adoption of Frost Queen's Claim on AP midlaners, in hopes that its 2 Gold Per 10 seconds + Tribute gold would help offset the price increases slightly (not to even mention the active, which is great for avoiding ganks or pursuing enemies). Mage powerspikes have also started to lag behind slightly, as some items now cost much more. In some cases, Mages have to hold onto large amounts of gold (1000+) in order to upgrade some of their items, such as the high tier mage items (Zhonya's, Rabadon's, Luden's, Archangel's, almost Rod of Ages), while the build paths of many of the more major AD items (Looking to Infinity Edge and Essence Reaver) only cost a few hundred gold to upgrade them from their base components to their full items. Is the ideal solution here to lower the gold cost of AP items or revise their build paths so AP users don't have to feel like they need to hoard gold?

So what is the data Riot managed to gather from two patches worth of games with these AP item changes? Can you share any insight or possible plans Riot may have in order to address this problem, or if Riot even finds this to be a problem at all?