"Nabucco is not designed to substitute Russian gas…Nabucco is designed to offer complementary alternative gas quantities.”No, that's not what it was designed for. It was designed to give Europe an energy source independent of Russia. That's why it's called Nabucco.
This was all dead on arrival anyways when Turkmenistan signed on to give Iran 20bn m3 of gas annually. Or maybe it was dead on arrival when it turns out that Turkmenistan may not have enough gas to keep Russia and Iran (and, you know, itself) supplied after some reserve estimation went awry. And it definitely looked toast when Blue Stream became a reality.
All of the sudden, Europe is balancing between Nigeria, Russia, or Iran for its energy needs (other sources exist, of course, so if you want to convince me that Indonesia or something is the secret, just wiki and reply). It's been effectively closed out from Central Asia unless it deals with one of the two latter.
I hate the sort of journalism that talks about the "door to Central Asia" and some such tropes, but unless Europe gets creative, it looks like it doesn't have the key. And if some folks in the Caucasus start reading Global Guerillas? Then let's hope that creativity comes all-the-more quickly.