I think supports are fine.

Here are 26 champions that can play support and be effective. It seems to me like support has the most viable options of any lane. While some like hiemer or fiddle are niche picks, they still see play. If you want to argue that most don't see competitive play that's a valid point, but high elos tend to play the numbers game anyway for every lane.
I worry that by increasing gold and experience gains on supports, utility mages will be rendered obsolete by typical burst mages. While it I don't think a change in the meta would be a negative thing, it would just be trading one set of viable champions for another and people would find something new to complain about. Imagine if annie had even more money to buy the damages. =(
As a support main, I am currently enjoying the role very much this season. Supports have enough early game presence to carry a lane, and I enjoy playing a more play-maker role late game. As it is, my only complaint is the return of the tank-meta which I find boring.
TLDR - changing gold and exp gains would only change what supports were viable rather than adding more to the pool. This is fine if you want a meta-shift but is not a magic bullet to make it more diverse.
EDIT - Added
for you fabulous s***lords.
+ 800
) before purchasing an item for mana regen, and then it's usually a chalice that will build into
. And in the mean time, a huge amount of the support's usefulness comes from casting spells, which can get very expensive (missed a
or
, but even with that much burst they wouldn't be able to scale nearly as well as, say, a more traditional Soraka-
duo. On a much larger scope, the core role of the support should be to provide assistance for their team, so whether they do it via utility, tanking power or crowd control (or even just raw damage) is fine, as long as each contribution carries its own strengths and weaknesses, which they do.
I am not assassin or carry that should be greedy for gold. I still can be useful for team even though I give up half of my exp and all my CS