Is it time to shift around some cooldowns via Mage update 6.9?
Simply put, nearly every single mage item has cooldown reduction now. This update has basically made any mage build max cdr at full item build no matter what build route you take. There is no more decision-making on whether or not you want max cdr VS more ap VS a purely defensive item.
Here are some item changes that brought this upon us:

Mage update 6.9 - Received 10% CDR, -10 AP, +10 MR
Now, this item was already a popular buy for mage vs mage mid lane, but adding CDR onto the existing item has made it a Core item on pretty much any mage no matter the cost change of +400 more gold.

Mage update 6.9 - Received 10% CDR, -30 AP, Active Cooldown +30s
Once again, a core defensive item for any mage. Hourglass lost 30 AP, but obtained 10% CDR. The cost to build Hourglass dropped dramatically as well from 3500 gold to 2900 gold making it easily obtainable in the early game.

Mage update 6.9 - Added to the Game
Seriously, for 2500 gold you get 300 HP, 60 AP, AND 10% CDR. Not to mention a 40s cooldown dash with an uptime that it quite frequent. Did anyone notice the .35 AP Ratio?? There is no reason to buy a Hextech GLP or Gunblade over this because it just isn't cost efficient plus the Protobelt offers cooldown reduction...
Questionable changes in 6.9:

Mage update 6.9 - Lost 20 AP, -25% Mana Regen, New Unique Passive: Aching Blood + Harmony
Ok, so a core mage item in season 2-3 has gone from being the go-to sustain item to a SUPPORT item.
Item: Will of the Ancients
Mage update 6.9 - REMOVED
So what, we've lost all sources of Spell Vamp besides Morgana/Akali passive. Might as well change their passives as well and remove Spell Vamp completely.
Current Meta:
The problem with the current Mage meta is that if it's not cost efficient, it's not good. Why do you think prior to patch 6.9 everyone bought
? Because they were dirt cheap for what they offered. The only item unchanged in 6.9 that I can see as still the go-to item is
because of the Morello's nerf and its cost efficiency literally destroyed. Why does no one buy
? Well it's 3 4 0 0 GOLD for whatever the hell this shit gives us. The base stats are just not suitable for any Mage and a waste on Mages that can make somewhat use of it
.
End Note:
So I know Riot feels that any major update needs some fancy gimmicks added and changed, but these changes via Mage update patch 6.9 have had a negative effect on the itemization of Mages. Hell mages never had any itemization choices to begin with.
Who uses this? Only Ryze... How about
? Umm... Nobody.
? EVERYONE.
Remember when max CDR was a luxury? And don't get me started on the mana regen removal on tear paths and Morello...