Betty (my name for the Rift Herald) isn't anywhere near as bad as you'd think. She can be shut down quickly when she's released into the lane - she has to be right by the enemy turret and even then, two champs can usually wipe her out within 10 seconds or less. With that said, I hope for a Betty figure in the merch store, maybe with the old herald as a two-for-one deal!
Turrets require SIGNIFICANT buffs, period. I also think AP champions deserve their very own mastery as everything scales with AD and AP together or just AD. I'd like to see a pure mage keystone at some point. The one keystone I see the least is either stoneborn or stormraiders, maybe one of those can be changed. Nerf damage, I agree 100%
EDIT: BUT, I rather have shorter games than 45+ minute ones so I can play more often and use different champions. A few 30 minute ones are infinitely preferable than fighting out a 57 minute game that EASILY could have been won by 25-30 minutes.