dewster, I'm getting the impression that you have not often met or worked with professional thereminists. They naturally prefer all well adjusted, stable and linear instruments with an adapted pitch range etc. But the examples of Lydia Kavina playing on the highly unlined tVox tour, Peter Pringle playing all kinds of historic tube ovens and Thorwald Jorgensen who has played for years on a simple Etherwave Standard show the following:
A true genius does not forcibly need the "perfect" instrument, one which does just not limit his musical expression is enough. The rest is the cherry on the cake.
On the other side, a Steinway will by itself not improve the performance of an untalented musician.
In order to make the theremin more popular, we need more professional players and teachers and also common quality standard for teachers, lessons and players. Actually, everybody can call himself a thereminist, even if he has never seen a music university from inside. A lot of "nebbachs" publish tons of unqualified theremin stuff on the internet and many performances which find favor in the eyes of the theremin community would just earn tomatoes and eggs when given at the same quality level on the violin.
What we need to do first is to raise the bar considerably, to sort the sheep from the goats and to raise the reputation of "our" instrument in the eyes of compositors, conductors and music teaching institutions. The day when the first thereminist will obtain his diploma from the Juilliard School of Music we will see an important increasing of durable and relevant interest. Then, there will also be a market for professional instruments.
A professional violinist will spend $30,000 or more for a professional instrument because it is commonly accepted that the violin is a precious instrument. Seen the number of mails in which people ask me where to buy a used instrument because they find $500 too expensive for an Etherwave Standard, the Theremin is still playing in the toy league.
Thus we will not have to build cheaper, but more expensive and less easy to play instruments in order to valorize them in the eyes of potential musicians!
@Fred: Sorry for partaking in the hijacking of your thread. My house is open for you whenever you want.