A Cheesy Idea I just had that no one would like.
What if MOST items in the game where adaptive, instead of AD or AP.
So
: Would give either 70 AP or ~50 AD?
: Would give 65 AD or ~80 AP and either Lifesteal or Spell Vamp
: Would take 50% of the base AD and covert it into either AD or AP
: 120 AP or ~90 AD with the passive working adaptability. 40% AP and 30% AD
While some items would still be class specific.

Obviously would never happen, but it would make for some fun builds. Maybe in this world make Mage/Ap assassins spells crit as well.
Oh and all items would keep the same build paths.