This is the engineering/design/marketing tradeoff that has to be made for all consumer products. In the case of Diesels this may mean that the bottom tier of cars will never be diesel. This is OK - it's market forces at work. VW was trying to cheat reality by cutting corners on their emissions systems. Chevy didn't cut those corners on the Cruze CTD. Mercedes apparently hasn't cut those corners either.
While VW did compete directly with the Cruze.....Mercedes, or at least the ones sold in the USA, are a completely different class of vehicle. This is not the case everyplace however. Mercedes does make a lot of lower end stuff elsewhere...none of it importable to the USA until they reach 28 years of age when emissions and safety requirements are no longer required to be met.
I plan to import two of my Antique Motorcycles this year from Europe. Freight cost makes shipping two more logical due to weight density and the newest of the two is now exempt (have for a few years actually). And the Euro/ Dollar exchange is finally in favorable territory again.
Excessive complexity is also planned obsolescence. Many parts to keep them running will unlikely be available to keep them on the road too many years...unlike the far simpler older stuff.
I don't oppose reasonable emissions....I do oppose oppressive ones. My Civic is now emissions exempt...I could legally remove the cat...but I won't. I would gain nothing by doing it. And it has never once failed a once every 2 year test in its entire life. Despite having an engine Kalifornistan considers illegal. It passed the strict dynomometer based emissions tests since they were instituted a lot of years ago...some of the strictest in the country.