I'm not sure what the peak of state nationalism was, but I think we're well beyond it. There's not a country in this world that I'd die for, I don't feel even remotely bad about that, and I think this view is the norm. In the future all the borders and systems we know will be long since shuffled around. Why should I care about perpetuating any given state today? Give me a place where I can reasonably safely raise a family and earn a living, and I'm good to go. I couldn't care less if it's under El Presidente or Gandhian Democracy. I'd obviously prefer the latter, but not to the point that I'm willing to die to prevent the former.
I'd also add that I think we're probably beyond it on the order of centuries. Every war since (and including) the US Civil War has relied heavily on forced conscription. If the only way you can get people to fight for you is by force, then clearly there's no grand ideology anywhere but in the propaganda.