I think we chatted about imperialism in other threads recently, but this Trot article may be of some use:
Lenin, Kautsky, and "ultra-imperialism"
The only post-Cold War supra-national institution really worth considering in terms of Kautsky's argument is indeed the EU, but then again there are competing interests. Take, for example, the rise in the euro. I read in some recent news that Germany was enthusiastic about the currency's appreciation at the expense of the US dollar, but that France wasn't. Ironic, considering that Germany is, at least for the moment, the world's largest exporter.
"A new centrist project does not have to repeat these mistakes. Nobody in this topic is advocating a carbon copy of the Second International (which again was only partly centrist)." (Tjis, class-struggle anarchist)
"A centrist strategy is based on patience, and building a movement or party or party-movement through deploying various instruments, which I think should include: workplace organising, housing struggles [...] and social services [...] and a range of other activities such as sports and culture. These are recruitment and retention tools that allow for a platform for political education." (Tim Cornelis, left-communist)