The reason why increasing gold generation isn't a good solution for "support mains"
The Ancient Coin line is overpowered. I'm just going to assume everyone already knows this and move on.
A common solution to the problem of Ancient Coin giving way too much gold for literally doing nothing is to "increase the gold generation of the other support items" (so that they can be on-par with Coin). This has more negative effects than you might realize. The thought behind this suggestion is "Supports will have more gold, so they will be able to build more items" which would make support more fun, right?
https://media.giphy.com/media/3oz8xLd9DJq2l2VFtu/giphy.gif
Support items are designed to be cheaper because supports have the lowest gold budget of any role. When the support role all of a sudden gets tons of free gold, who becomes stronger? The champions that can only build shitty support items, because their AP scalings are shit, or the ones that are building big boy items that scale infinitely better? Increasing Spellthief's gold isn't going to show the resurgence of aggressive poke supporty champs such as Nami, Karma, Lulu. No, it will propel supports such as Brand, Zyra, Vel'koz, Annie, etc to top tier. I'm all for carry-oriented supports being viable, but when real supports are overshadowed by their full-damage successors, THAT'S when you begin distorting the purpose of the "support" role.
Same thing for Targon. Increase the gold gen and suddenly Tahm Kench becomes immortal. Not to mention ADCs would probably start doing more of the relic-shield-first-back thing that has emerged recently.
Now, for some of you, this sounds like a good thing because it buffs your champion and hurts champions you don't play. Fuck you. But if Riot decides to go down this path, they would probably have to tune up the weak "traditional" supports to be able to make use of the extra gold. And what happens when those supports can make use of gold? They stop being played support, and you will begin to see cancer such as solo-lane Lulu becoming the dominant way to play her; it would imminently create a balancing nightmare.
So...
Nerf Coin.
and I wasn't too happy about the speed reduction after the W at first. But it is what it is and I've since adapted to the skill change and I'm still doing fine with Blitz if I do say so myself.