Kripps predictions are usually correct, and in his last video talking about the new Updates for PvP, he clearly states within the next year there will be a ladder system.
I, for one, am very glad to have a Ladder System back when it does come out.
This game was founded on a Casual AND Hardcore player base, not just one or the other. The thing that kept Diablo 2 Lord of Destruction, alive, was the ladder system.
Those of you who don't like Ladder system either quit D2 when it came out, or never got into the Diablo franchise, in which its hard-pressed to listen to a newcomers opinion which could possibly be another horrible idea for Blizzard to Incorporate into their design philosophy. (Very little people quit Diablo 2 when the Ladder came out btw)
EDIT: Actually, there was an option to choose "Non-Ladder", if people didn't like to play ladder, so there was an option for everyone.
Ladder isn't just for Hardcore players, want to know why? At end game, in this Diablo game, everyone can switch their skills whenever they want. That end game choice you made at level 60-80, when you dumped all your stats and skills into the spec you wanted was , how they say "Meaningful", but that is no longer the case.
Everyone gains the same amount of stats each level for your class. So that is already done for you, and skills you can swap out at anytime. If anyone is defending a ladder to be a hardcore thing anymore, it would be very hard to argue your case.
A ladder has much more positives than negatives. Especially if a franchise already succeeded implementing one into the game.