My opinions on the "Tank Problem"
I honestly don't find it that bad... I ONLY play tanks and playing them is very bearable at ALL stages of the game. My 7k hp Cho or 5k Voli or Shyvana could care less about your BoRK or LW. Idk, I just feel like tanks aren't as bad off as everybody puts them out to be. I do agree that they could use some help item-wise, and some more late-late game power, but everyone overlooks the 1v1 power of tanks. They really aren't that bad, guys. Even a Sejuani, who for some reason people think that she doesn't deal a lot of damage, can safely fight people quite easily. Have you ever seen a fed voli or mundo? Its terrifying. And places where they ARE lackluster can be redeemed with their strong cc/ initiation powers.
tl;dr tanks really aren't that bad in shape as everyone says.