Please change the Alliance Grove Reward Dragons soon. We have competed for these same ones an Extremely Long Time. Most of us have all of these. With no real intentions of empowering them with more orbs. After such a Long Time, the motivation to compete for them just isnt there anymore.

They need to be changed Way more often than they have been. This is at the Core of Alliance Activity and it feels more like an afterthought.

I don't think they can change the alliance chest dragons because this is the only way to get orbs for those dragons. New players will always need to get orbs there.
What they can do is offer orbs for different dragons along with the regular ones. Have orbs for one or two different dragons every chest.
But I disagree about not empowering those dragons. I empower whatever dragon is available. You never know when they might be called on for some new rules arena battles.