So Mage Roster Update = Mage Roster Nerf

Looking over the PBE notes, I mostly see these trends:

1. General AP item nerfs (Zhonyas -30 AP, RoA -20, -10 Abyssal, -20 Grail, +20 Morello)
2. Geneal base spell damage nerfs
3. General (small) decreases to spell cooldowns

Okay, I get that Riot is trying to make mages "sustained DPS". But that's a profoundly stupid idea because it relegates the class as a whole to being nothing more than an inferior sub-class of magic-dealing marksmen. Marksmen don't run out of mana. Marksmen can buy sustain. Marksmen can buy QSS without compromising their build. Marksmen ca buy large mana items without having to hide for 10 minutes while it scales. Marksmen can get MORE damage+mana regen+CDR from Essence Reaver than any mage item. Marksmen outscale tanks, mages do not and can not. Did you know the top champs for Mana Regen at 18 are Marksmen? Jinx has the highest in the game. Marksmen can just "buy" tons of AoE damage from Runaan's, Shiv and Rapidfire. Most marksmen have dashes, while virtually none of the non-assassin mages have any escape at all (and the few with speed buffs have to stop in order to use them).