Arnwolf666
Adventurer
My strong bet is DL because Margaret and Tracy Hickmann.
Why? It is the least difficult to convert to 5E campaign world. You only need special rules on Dragonlances and Moon magic and there you go.
Plus, if done right, it can attract many players, especially new players. I mean, riding Dragons and using Dragonlances, plus an epic backstory, that surely can compete with infernal warmachines doesn't it?
In these flashy and shiny times concerning media, that would be a thing. You could even do a sophisticated movie with this stuff (If you would get the right way to convert the specialities back into the "Real world")
I mean everybody watched GoT, and DL has the potential to top it if you get the special effects right and do some flashy marketing, it would be costly, but doable.
I don’t think so. It has a proven record of not being a great setting for sales. The novels are great. But the setting was too tied to the novels. Although I would love to see it.