Raging Turrets
Everytime an allied champ dies under turret, turret launches a missle barrage that does aoe damage to all enemy champs within range, damage = 1, unrampeded up turret attack = equal damage to (first attack), ramp up effect does not get reset against champ that is currently taking curret aggro, this effect does not stack with ramp up damage (champ taking ramped up turret damage will not recieve extra hits).
Implement something like this and you will start seeing people actually start to respect turret and calculate their dives instead of being so f*cking mindlessly divehappy.
Vengeful Turrets
When allied champion dies under turret, turret automatically focuses opposing champ with least effective health quantity.
I know it might be stupid but these are just propositions, as the game keeps introducing more mobile divehappy champs (bursty, versatile and mobile champs), turrets keep getting weaker, they could do with an update that actually has an impact.
Maybe this way people wouldn't be so encouraged to 4man bot 24/7 thanks to how easy it is to succeed at pretty much all stages of the game.