The industry spends billions of dollars on developers writing Java. If they could spend 3 times less by simply training developers to use Smalltalk instead, they'd be doing it.
They're not, because that's not the problem.
No they wouldn't. While not bad long-term thinking, by the time developers are up to speed with Smalltalk and realizing three times the output, the competition using the ecosystem its developers already knew will have launched something and won over the customers. It doesn't matter how much software you can crank out after you've already lost.