Perhaps if bananas weren't largely a monoculture rife with clones
The current most popular cultivar is the Cavendish, which is a cloned monoculture. This has some benefits: it means they're consistent in size, shape, and growth patterns, and they're seedless.
There are many other varieties of bananas, but most of them don't travel well. Bananas produce ethylene gas, which causes the bananas and other fruits to ripen faster, not desirable in fruits shipped long distances and then expected to last several more days. Maybe Cavendish bananas have a relatively long shelf life, but I don't know.
There's also the problem of consumer acceptance: apparently people think "banana" means something that looks like what they expect a banana to look like and aren't eager to experiment. Still, other varieties are available.