I disagree with your train of thought. LTC, NMC, and PPC all sustain very original ideas that separate them from each other along with a solid dev team. NMC is probably the most original and might end up being one of the most successful. It's understandably skeptical to believe that .bit domains will become dominant in the near future over alternative domains, but nobody can really predict the future of technology. If the tech and access to such domains were to improve, perhaps a consumer base would be interested in having access to internet and marketplaces outside of the regulation of governments.
Exactly my opinion, too. You named the alt's I also see most potential in (and own some, although surely less than 10% of my BTC holdings even if they are combined). NMC is surely the most interesting and has a lot of potential (not just for .bit domains but also lots of other uses that are currently under development).