What if we just doubeled tower damage?
Would towers then be somewhat respected? Would it even make a difference?
To be honest towers still appear too weak for me. Just had it in a previous game where an Irelia dived me under the tower as low HP Lissandra. Sadly I had no ult, but I had my W, so I thought: "Hey, rooting an enemy under the tower is not exactly a bad idea and she has not a single armor item, so let's do this". (She had lots of Spirit Visage, Merc boots and a Trinity force)
What I didn't expect was that four consecutive tower shots didn't even take half of her health.
By the way it stands we might as well replace towers by gigantic caster minions, then at least they wouldn't give the illusion of safety...
but their defenses are
at best - that is your typical bruiser. While tanks actually go for lots of durability with much higher effective HP.
This change would hurt tanks much more.