That is an interesting read. I have been comparing the Travato to European offerings as well, mainly on the class B forums. There are three main differences which keep Winnebago from just cloning a popular floor plan. One is that here in the US, we use black/grey tanks and not the European style of cassette toilets. So, this requires the commode to be right on top of the black tank. Two, US rigs have air conditioners and generators, which both take up a lot of space, especially underneath.
Third, the US doesn't have access to Truma's products, heaters which far outdistance anything sold on this side of the pond. Combination furnaces/water heaters that are less than the size of the four gallon Atwood.
Hymer sounds interesting. We had ~850 "B"s sold in the US sold last year. If a company can get in the US market and start making them, it would be those guys.
As stated previously, this is uncharted territory for US RV makers. The Ducato has been in Europe for almost a decade. So, it will take a while before the US makers get up to speed with this platform. For a "version 1.0" van, the Travato is a good start. It will only improve from here.