It’s about time we get new heroes in the rotation. Cast and Hardscope can be farmed very VERY easily, for those who want/need them. Allowing a little more variety on the monthly calendar is not going to hurt anyone or anything, quite the opposite actually.
Also, we are getting new Heroes monthly. Even allowing one of them to be featured on the calendar of their debut month would be great as it will allow more players to unlock the characters a bit faster along with the raids, so they can assist their Alliances during Bounty Events.