I don't think its the industry or the American consumer. Asian pears I believe have past consumer acceptance levels. There are just factors not in A-Pears favor. E-pears are picked firm and improve with storage A-Pears while they can be stored, they are picked ripe and do not improve much with storage. Fewer can be grown on the same amount of land as they require thinning to achieve market size. only seeing one type of Asian pear is due to there only being around 25 commercial cultivars vs the thousands of epear cultivars to choose from. During the season you can fill the shelves with Bartlet flavor profile pears every week. Not the same for Asian pears, which are going to flood in all at the same times when ripe.
Pear breeding in the US is also an issue. Brazil and Australia are breading pears for there climate. That would hopefully bring new product to the US. What pear breeding that is goign on in the US is focusing on fire blight. I know with Apples at least Europe tends to breed for scab resistance and the US breeds for firelight resistance. 'Gem' a fireblight resistant pear was released in 2015 it was crossed in 1981. Gem from what I understand is just an OK pear. It will likely be the parent or grand parent of good cultivars years from now.