I think...if it sounds and feels like a Mellotron with 100 sounds and its portable...I think a lot of people would be interested.It could actually not only affect the memotron but the whole used market as well.
This re-states an interesting question. What state is the 'used' market in? As far as I can tell, everyone who wanted a real Mellotron has one until the last one sold out. The market is probably nowhere near as fluid as it was before, where they were changing hands a lot more. People advertising them on e-Bay usually give the reasons 'need more room' or 'need the money' rather than 'the thing is fucked and I hate the sound'.
Buying a Chamberlin M1 for 7000 dollars wont really make as much sense anymore...
Did it ever? :-)