It just occurred to me that 5.5e will surely at some point get its own dragon-focused epic hardcover adventure, to mirror the first one for 5e. They're going to want to showcase these new dragon designs, and that seems like a great way to do it.
I know a lot of folks want WotC to set the Forgotten Realms aside for a while, but I think a Dracorage* adventure would be fit for purpose. Let's let goody-good PCs throw down on some metallics!
*(In FR lore, an ancient elven high magic caused the periodic appearance of a particular comet to trigger a collective, senseless, temporary rampage in all dragons, no matter their usual temperaments. The source of that magic was undone about 120 years before the "present" year in setting metaplot, in the novel series The Year of Rogue Dragons, but I'm sure WotC would be perfectly content to revive the concept, and I hope they do.)