Interesting thoughts on the effects on the value and market for treadles. I know there are a few companies that still offer treadles or treadle compatible machines. I doubt that we here in the states will notice any really appreciable difference in the market. Treadles here are already mostly bought and sold as antiques for their decorative rather than functional value. It may actually increase availability as the charities that have been acquiring and shipping treadle and handcrank machines to remote areas turn to shipping solar panels and motorized machines instead. Also as solar panels become more readily available I see an increased demand for newer zigzag/decorative stitch machines in remote areas where it was difficult to have one before due to the relative difficulty of fitting them with a handcrank or treadle.
Rodney