Not sure that's the question. How many boats get successfully re-launched 15 years after they debut? If there really is a market for that sized day sailor, why not design a brand new boat (the J/10?) to satisfy the demand, and have the ability to update/evolve those features that are now out...
To pig pile on with Cap't Jack, when the J/109 came out, a frequently heard criticism was that it was no faster than the 20 year older J-35. Yet it managed to sell 350 boats, so plenty of people, myself included, thought it was a good performing boat, and I took great pride in owning one. ...
All boats are a compromise. To make it a daysailor, its only got a small, easily tacked jib, didn't originally come with the sprit and has not much more sail area than the J/29. While there are certainly J-29s that don't perform well, we all know the boats potential, and easily write off poor...