I would suspect that the market for any of the 3 wheelers is quite finite, hence the lack of sales, that's not going to change for the foreseeable future whilst it may have a favourite spot in the hearts of its followers, I don't see people queueing up to buy it and hence the forecast rising value. It is not alone in the market place there are other 3 wheelers.
If the M3W is anything to go by the factory hasn't been that supportive with spares etc no sooner production ceased. I always question a dealers advice especially if he has stock of the item in question that he wants to shift.