I leaded with Anivia is a special case that has always been forced to build high mana sustain items, similar to Cassiopeia. They are both sustained damage mages, and that's not what most people are concerned about right now.
It's the burst/combo mages that are more heavily impacted. Your Lux, Brand, and Ahri's of the world. These champions simply can't compete with all the manaless/energy based champions today. Zed misses his first 4 Q's? No problem, he can keep throwing them out there. Lux misses her first three Q's? Better head back to base, you don't even have enough mana to combo your abilities anymore.
I also fixed the sentence just for you.
I also know Ahri isn't too bad currently -- her high mobility makes up for some of it, but once DFG gets removed I think she'll be thrown back into the bin of mages drowning in their own
.
Apparently the mage type class doesn't fit in line with Riot's "LC$ big playz" design philosophy that they've adopted. Sad days indeed.