Birthright would work well as half-RPG / half-miniatures-wargame (either physical or virtual) / half-civilisation-type-boardgame / diplomacy-type-extended-play-boardgame for a setting that can achieve 200% of what traditional settings can offer outside “conventional” TT RPG. “Anerson-ize” the game to make it coop. or Players-vs-Referee rather than PVP and you have something new(ish). Whether that is something people are interested in is up for debate, but that is what Birthright could have brought to the market.
They could have gone this direction with either Birthright or Dragonlance. WotC chose Dragonlance, which now greatly diminishes the raison-d’être of Birthright. I love Birthright, but I wouldn’t be holding my breath anymore.