I think that you would sell more F16s than you think. As for the other issues- hard to really relate as I am not a dealer so i certainly can't speak to that.
In truth, if I were always sailing in winds of 20kn I would want a custom sail with less area on my Blade for sailing solo... but that being said, the stock sails do depower very well.

bottom line, I think, IMO:
When customers feel the weight compared to an F18 they will want one.
When you take the husband aside and tell him that he can sail it solo if she ends up not liking it they will want it.
When they are up to it- and sail with the spin solo they will want one.