Dumb Idea: Change towers to magic damage from physical.

So I thought a bit about towers and how one of the biggest suggestions is to give them %health true damage. Personally I think that's a fucking retarded unwise idea because while that does discourage tanks from holding aggro (like they're supposed to) it also encourages dives from champions that can better avoid aggro.

So basically make a pie for Lee Sin, cause he'll be stopping by more often and it's rude to not offer something for a visitor.

Back to towers: towers do physical damage which is mitigated by armor. Armor is not only relatively cheap, but it's also the second most common resistance (outside of health) so stacking it isn't a problem and a lot of champions get armor per level. So why not change towers to magic damage?

Magic resistance is -Less common than armor. -Sucks against sustained magic damage (though FH doesn't slow down towers) -not everyone gets it per level, encouraging more durable champions to dive.

Now their are some issues, the main one I'm seeing being that Maw assassins get more freedom to tower dive, but I'm sure it's something we could work around.

Thoughts?