NameCoin doesn't work without the blockchain. Zokoo's triangle is a hard problem, and it just so happens NameCoin is one of the very few things (maybe the only thing) that actually solves it. We would all like a globally unique, secure, and human readable naming system that doesn't require the user to download a blockchain... we're just waiting for it to be invented at the moment.
This blog post made it pretty clear that the traditional .onion addresses aren't going anywhere, although they may be increased to 54 characters. All of these proposals are extensions on top of that. Idea #1 allows for many different naming system modules to be used, so you can just use the ones you like the best. Nobody is forcing anyone to use anything.
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