How about some design goals.

Make them cheaper - a 25k i20 is obscene.

Make them lighter. - There is no reason a f18 has to weigh 400lbs.

Make them more durable - and make the components durable, get rid of hollow rudders, and make them kick up.

Make them easier to right, (Tikipete's right on)

Make them more comfortable to cruise - Add wings or extension seats for when you dont want to trap out, so you can easily take friends and family and not worry about if they can trap out.

Make them easier to rig.

Make them fun to sail - bigger rigs, lighter weight, more durable all add up to more fun, less fuss.