Yeah I don't think anyone wants that, but I'd argue as Sirrian said you didn't need the guardians to be mythic to be potent. Not even close, you just needed the traits.
So in that aspect it shouldn't be about the haves and have nots.
Now when you factor in that a lot of players won't have the stones to trait them, then maybe. But at least that can be earned out-right.
But yeah I despise Courage and Justice and don't really want to see a new batch introduced.
It could be worse than the guardians really. Just for simply participating in the GW you get a copy of the troop, so it's a bit like handing out firepower to everyone. If it happens that they are guardian-tier powerful.