The plan for arena has never been to keep the current format forever. We have some other ideas for how to make arena more interesting we look forward to sharing in the near future. We didn't think purely Wild was a sustainable format for Arena because it's hard to feel like anything has changed when the card pool is so large. There are certainly ways for Wild cards to come back to arena that would be fun and interesting, and we're open to exploring some of those options in the future.

No. As with most decisions there have been opinions on both sides, I wouldn't consider standard vs wild arena to be heavily preferred from either side.

Not sure what you mean by this, but we don't want to split off into two separate modes if that's what you mean. I think we'd rather change the main arena format in some way that keeps things fresh. Arena has been purely standard for awhile, and we're approaching a time where we think doing something new is appropriate, if only for a short-time.