The existence of the RV-10, Velocity, and Lancair 4 have rendered the beautiful and interesting Wheeler Express just about irrelevant.
The existence of the Aero-Mirage TC-2 and its modern offspring, the small Lancair 200, the KR2S, the MCR100/Ban-Bi series, and a dozen other 912 powered LSA airplanes have rendered the interesting little Polliwagen completely irrelevant.
The flying crowd is in want of something unique, but you do have to deliver or it will not last long. Polliwagon, Wheeler, BD5, Raptor and lots others got a shot in the sun. Aviation being the Show Me State of product development only will put up with slight growing pains. Stop the train, and people get off pretty fast.