At first it was just AD, then AP, now health? How about defending?

At first it was AD that was used to damage towers meaning players had to keep track of AD champions split pushing in order to stop them. Later Riot added AP scaling to AA damage on towers. This created a system in which towers could be taken very fast as most champions could demolish towers. Now, we have tanks with the ability to take towers down with their health? This is getting crazy. There are way too many options for taking down towers and not enough for saving them. It's become really hard for anyone to defend against split pushers. Why are there no meaningful options for a player to defend with?

Now, I'm not asking for an all out turtle style as that could get problematic in its own but being able to turtle a little bit with all these anti-tower abilities would be a healthy thing. I think it would be a healthy thing to have a rune tree that is designed for holding a tower. Make it so that the champion guarding it has to be removed before making the tower so easy to take. This could be done by diving them or poking them out. However, as long as that champion remains it should be harder to destroy the tower.

It would certainly be a hard balancing act as you don't want to make it too easy to hold a tower. Things such a tree should NOT do is: Increase champions survivability or regen tower health. The key to balancing the tree is that a tank guarding would give up some defensive stats to hold tower longer but that makes them more vulnerable to tower divers that can easily reset tower aggro. Make no mistake this would be a primarily tank tree and it should have the goal of neutralizing all the extra damage towers take.

Thoughts?