To be honest with you, I think A Disney Nautilus correctly done would sell fabulously well. While there is demand for Star Trek kits amonst purists such as those found here, I think the market has been saturated with Trek kits for the last few years, at least as far as the average guy is concerned.
However, there has NEVER been a kit of the Nautilus. While the potential market for a Nautilus and other 20,000 Leagues kits may be smaller than the Trek market, that market is pretty darned unsatisfied right now and I would therefore expect a very high take rate on any new models.
Huzz