That's an interesting difference. While it is true that writers returning to a series years after leaving it (for whatever reason) have not produced work that has been as acclaimed as their first run, this would be the one story they wanted (or needed) to tell. Then again, there are many talented writers out there who haven't worked on a character but may have a good arc they really have faith in. Something like the Black & White, Black & Gold, or the Red & Blue series out now. Except these would have a longer multi-issue story and be in full color.
The mere fact that it wouldn't be all Batman, all the time has an appeal to a section of fandom. New and Different, or Classic, but Improved?