As I understand it, breadfruit trees produce seasonally, so that when they ripen, you've got a ton of breadfruit to deal with, and figure out how to preserve/freeze etc. And then, for the rest of the year, you have no breadfruit. I thought that was the barrier to its viability as a commercial crop.
Anyway, I'm glad I got to see the fields of cane growing out of the bright red dirt on either side of the highway from Kahului to Wailea. I even made a wrong turn and ended up in the parking lot of that sugar plant-it was about the most industrial thing I saw on Maui.