Good read, although I hoped for bit longer text that goes more into details...
That's basically how I see it, too. I just don't understand what were you trying to say with this "I think the system could only last up to certain period of time". All systems (of alliances) last only up to a certain period of time. In the 19th and 20th century we've seen Germany, Russia and UK allied against France; France and UK against Russia; France, UK and Russia against Germany etc...
That Bismarck's lasted for so long in a volatile climate that is 19th century Europe is a credit to his skill...
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