Take tenacity out of boots and put it into some real items

Right now, the only places you can get tenacity is from elixir of iron, masteries, and Mercury Treads - and you know, that may be a reason that it's so goddamn weak.

If you buffed tenacity on Merc Treads, it'd box out basically all other choices out of necessity. And while boots do give a reasonable increase in stats for their price, none of them are so noticeable that you couldn't possibly do without them right now. This keeps tenacity from ever being really relevant especially against teams stacking CC on CC on CC, because it can't be strengthened or it'd knock out the balance in movement speed items creating another Homeguard's situation where it's the "have to have" item.

So you know how you fix that? You put tenacity in some items - an AP item, AD item, bruiser item, whatever. Put it in several meaningful items that may or may not have meh stats but give you something you could really need in the situations it would apply in. So maybe you have to give up that Youmuu's, but you'll survive getting snared by Morg now. Or you usually want Luden's for that extra burst, but you're willing to give up some of the damage to be able to get away if you get jumped.

That would be, you know, an actual fucking tradeoff instead of "Do I want to die to the ADC or to CC?"