You'll also need brilliantly bright engineers, to make a leap two steps beyond the competition, such as the A320 was when developed. Short of those two steps, it might not break even, and deemed risky never launch.
2 points
a) the giant (government) funding is not available
b) the cutting edge designers and visionaries (or the material for) are no longer attracted by aviation engineering.
In the global, evolved consumer capitalism of today, it is trading things not creating them that attracts.