Thank to all of you for your comments. The post of Dave Schadel surprised me, because I thought a big country like the U.S.A. did not yet have so much noise problems with RC planes. However, noise is maybe not the whole problem. Electric drives are just much easier to handle, so people change even if there are no noise restrictions.

Probably, Dave is right that one cannot stop the changing world. However, this is not only a change, but it's also a loss. Or could you think of man bearing Pitts or a big model of a Pitts with an electric engine? I hope that k_jitsu is right and YS interprets the situation to even improve.

Regards Matthias