Cleland does a great deal of moaning, still he was a good racer in his day so he's earned the right to have a moan about it if he wants to.
I do tend to agree that the diesel doesn't exactly set the soul alight with it's sound and it would be so much nicer to have a racing car sound. But that's the rules and SEAT are well within their rights to run TDI's if they so choose, as is the competition.
Diesel's are not unique to WTCC of course, with Peugeot and Audi both running diesel engines in endurance LM racing.
SEAT are competitive with the TDI, and whether they would be on the same page with a petrol engine is debatable. The independent Leon's such as the SunRed Leon's of Coronel and Boardman had mixed success today, Tom Coronel took away a pair of second place spots in the indy championship behind an indy beemer.
Would SEAT still choose to compete in the WTCC if their hard work developing the TDI were to be cast aside?