No no, the true reason of course is that he doesn't like Wurst, Bier and marching music......
I told you already that there were off court issues during his whole stint at Berlin. Lets not forget that last year, he was almost fired after CEV Cup defeat in Finland and some disappointing performances in the league. But as i said, they got their act together and had a pretty good turnaround.
Imho, he doesn't have a great authority with the players. You can almost see this during time outs and on substitutions. Also, this year, performances in the league were rather mediocre. Tonight they might end the season with 0-6 against Friedrichshafen. We might not even talk about an improved Berlin if they went out against Istanbul.... Considering all this, there are surely reasons for not extending the contract despite his evident successes.
And talking about Serniotti's successes i would appreciate if Niroomand would just shut up for a while and end the season with a bit of dignity. It would be truly fun, if Berlin still beats Friedrichshafen twice
This reminds me of a bizarre situation back in 2008, with what is known now as Zenit Kazan. They (narrowly) won the CL and... then the management kicked out the "difficult" head coach (Viktor Sidelnikov) in favour of a young promising Alekno. It then took three attempts (and quite a bit of $$$) for the prodigy specialist to qualify for the F4. Serniotti is an atypical Italian I must say, must be from the North of the country.