Hummer & Willys are dead.
Tesla - not viable for now, in desert conditions.
The rest - have a life of 100k kms, after that buy a new one. There is a reason why Japanese are numero uno - reliability.
Tesla cars are still in development phase. Also, I am not sure from where you are getting the idea that Tesla cars are not viable for desert conditions; I haven't found proof of this. B/W who drives a
sedan in the desert? SUVs and Jeeps are recommended for desert environments.
Tesla cars are a marvel of engineering and represent the future of automobiles. Moreover, Tesla cars are getting excellent reviews from people and professionals:
Tesla's P85D is the best car Consumer Reports has ever tested (Better then BMW, Porsche and Mercedes)
Ford is also planning to developed Tesla-
like cars in the near future.
Willys is dead as an independent
brand, but Chrysler have access to its technologies and produces vehicles [of similar type, matching quality and even superior features] under additional brands such as
Cherokee, Wrangler, Patriot and
Renegade. Details here:
Jeep SUVs & Crossovers | Official Jeep Site | Jeep
General Motors produced Hummers but discontinued it as a
brand. However, General Motors produces vehicles [of similar type] under additional
brands such as Chevrolet, GMC and Caddilac. These are just as good as Hummers. Details here:
General Motors | Browse By Vehicle Type | GM.com
Japanese cars are not necessarily flawless either. Toyota have history of recalling millions of its products to fix their issues.
As for the average lifespan of a car, they are getting better. Ford, in particular, is developing cars with lifespan of around 290000 miles. I am sure that some other American cars have comparable lifespans (e.g. Chevrolet). There are reports of some American cars lasting 10 years on the road
in-fact. In the end, a car's lifespan depends upon its maintenance. Good maintenance ensures long lifespan in case of every decent car.