How much potential did Brandon Lee have to break out into the A-list had he lived?
Or more to the point, the potential to break out in straight dramatic roles, that didn't immediately call for his physicality?
I was watching this video retrospective:
https://youtu.be/1EwmJ2Ycwus
It was noted that Brandon was you could say, ethnically ambiguous, which could be both a positive and negative depending on your point of view.
Regardless, Brandon definitely had leading man good looks and the charisma (as seen in Rapid Fire and Showdown in Little Tokyo) to potentially rise of above the decidedly niche martial arts market.