That doesn't change that it is currently a bad change to Pld's and can actually be considered a nerf in terms of everyday mob tanking... and, quite frankly, I don't think it's likely that they will make the changes that would be required to restore balance.The only 3 that I can even think of off of the top of my head are: 1. Increased Enmity gen off of RoH. 2. Shorter CoS CD and increased enmity gen, or 3. make flash do dmg. 1. Might be viable if Tp consumption wasn't such a nightmare. 2. Seems okay, but they could have done this at any time over the last year and have refused to, and 3... well, 3 is just straight up unlikely due to the fact that it's a cross class skill.
Oh jeez. Speaking of blind, apparently I am XD. Sorry about that. I don't have any problem with Blind being cross class effect... But I don't think it would really make a difference. The diminishing returns on Blind would be the same, and it's hardly a noticeable effect when Pld's use it, so, really, take it or leave it. Casters would probably get more use out of it than Plds do (all the power to them), but I don't see it making enough of a difference to warrant anyone changing their cross class skills for it.
That is fine and dandy on paper, but it makes no difference in practice. Casters already have the ability to control their enmity right now, but they can still steal hate easily enough off of Plds. Even as small a difference as 10 item levels can crush a Pld's underwhelming enmity over AoE spamming Dps. If they can steal hate with nerfs to their own enmity, giving them a buff would make it all that much easier.
Now, I'm not saying that it's a bad idea outright. I'd be fine with it, but not with the current state of Pld. Right now, they just don't have enough enmity to warrant making this viable. Pld's already have enough things that force them to over-use Flash to hold hate. Buffing caster dmg without giving Pld's a way to compensate would only make this worse.