I think this will be a one season wonder. Soon engine tuners will work out how to get the same performance from the new silencers and the riders will use them everywhere. The Polish lads will all be using them more often than not anyway, as they ride in Sweden, UK, etc and if Gollob, Hampel et al find themselves at a disadvantage in the GP's to the others, then the old silencers will stop being used in Poland pretty quick.
I have to say, i couldnt hear much difference when at Belle Vue this season. The racing is marginally slower, so what? The racing is just as good, plenty of overtaking inside and out.