It's true that if you want the specific things on your list, the choices in the US are limited. Manual transmissions are not popular here, so many models are not offered with them. Station wagons are out of fashion, both because of consumer preference and because fuel mileage standards are biased in favor of crossovers rather than station wagons.
Diesel cars have also never been popular in the US. In the early years there were prejudices against them because of smoky exhaust, poor availability of fuel (most drivers don't want to have to visit a truck stop to fuel their cars), and some ill-fated attempts by American car makers to market diesel cars, notably the Oldsmobile models. More recently, diesels have suffered because of the very strict EPA standards for diesel emissions (which impose tight limits on particulate and NOx, which are problem areas for diesel), which mean that many of the diesel cars sold elsewhere in the world cannot be imported into the US without substantial modification. Conversely, the EU put strict limits on CO2 emissions (where diesels do well) so their regulations were far more friendly to diesel, and the much higher fuel prices that prevail in Europe provided a stronger incentive to buy diesel cars.
Another reason that some cars from other parts of the world are not available in the US is safety standards. Notably, the US has a much stronger requirement for bumper strength than other parts of the world, so nearly every car model from elsewhere in the world has to be modified to include more substantial bumpers. If a company does not see enough market potential for a car to justify making a special US version, the car doesn't get sold here.
Finally, very small cars have been a hard sell in the US. Some companies do not choose to import their smallest models here. Notable examples include the VW Polo and the BMW 1-series, as well as all the Japanese "city cars".
All that said, describing the US as an underdeveloped car market is an exaggeration. There are still plenty of choices, though perhaps not the ones you want. (Like you, I find the paucity of station wagons frustrating.) And the US is the second most successful market in the world for hybrid cars (in part because of economic incentives to buy them), trailing only Japan and far ahead of the EU.
That one has already gotten a name - Xenial Xerus. And last I checked, a xylophone is not an animal.
The release after that has not yet been named. I'm pulling for Yakety Yak from the 1958 song by The Coasters: https://en.wikipedia.org/wiki/... Or if they prefer they can use the alternate spelling Yakkity Yak from the animated series from Canada and Australia: https://en.wikipedia.org/wiki/...
What I really want to know is what they will call the release after Zebra. Aambitious Aardvark, aanyone? It can also be argued that they won't actually have the alphabet crisis until they reach D, since the first three releases did not follow the alphabetic naming scheme that started with Dapper Drake. The first two were Warty Warthog and Hoary Hedgehog, and the third was inexplicably Breezy Badger rather than something beginning with C.
Perhaps the second alphabet series will be named for something other than animals. If they do musical instruments we could eventually have Xylophone.
I have a theory that it's impossible to prove anything, but I can't prove it.