I was afraid of this... this is Rift and GW2 all over again. They go in allowing you to be all things to all people which in turns means that encounters will be designed for that system. To me this takes the difficulty way down because you do not have a pure healer, pure tank, pure anything. You have hybrids to the nth degree. In Rift you had "freedom" but guilds and raid progression forced you into certain builds. GW2 took it to the next level. EQNext is going to be just as bad. There is really one word that will describe every player and every encounter.. generic.
Hopefully "pure" builds will be more successful but I doubt it. Remember back to EQ1, no one could heal like a cleric and all other healers had to rely on other abilities and spot healed on raids. I guess they want to get away from people not being useful. However, expanding the grey area doesn't fix it. Someone with 5 levels into healing shouldn't suffice or be able to sustain a group like someone who is specialized in healing. To me, that's what I heard. If I left the group, a pure healer, no big deal, the guy next to you who went a little ways into healing can make it work.