I know, but both are too complicated. "If something happens, this guy gains another ability" is fairly complex for an evergreen mechanic. What I was saying was, rather than having a new mechanic to replace protection, they'll just use different parts of protection, piecemeal, instead.
So for example, instead of a creature with "Protection from Red," they'd just print a creature that said "Prevent all damage that red sources would deal to this." It can still be enchanted, equipped, targeted and blocked by red stuff, but doesn't take damage.
It both allows them to get rid of a complicated keyword and have more nuanced designs. We've already seen them try this with both Avacyn 2.0 (she only gives the damage part of protection) and Fiendslayer Paladin (it only has the targeting part of protection).