The problem with everyone is that you (community in general) think every hero is meant for arena/HoL/raids... the important places. Some are meant for one place only. Cyana is great against Gizmo for example, although she needs an awakening, but not a rework. Killjoy for Gizmo also, and after awakening some people use him in Arena, although there are still better choices.
Jasmine was used in arena, now it is almost rare seen her in O1+, but still useful in CoF, Campaign and even HoL.
Gale for PP, some odd people still use her in arena.
And Leon is not the weakest, are yoz crazy? xD He is great, that you don't know how to use him doesn't mean he is the weakest, unlike your Boomer and Ember. That a hero doesn't deal damage, doesn't make him useless.
And well, you people should know that even though everyone (I guess) will be awakened, not everyone will be reworked. With their FB publication they even may awaken Drago xD if he somehow gets a good awakening, he could make it back to arena, even with a passive skill, like a good reduction of magic armor of everyone he could be useful for his tankiness (and increment of his armors and health in the signature item), just make an aoe magical team and melt the other.