As another poster remarked, strong nations adopting a warlike attitude to preserve their vigor is probably not going to work out well in a world full of nukes and bioweapons. If that becomes a popular approach, we're all dead.

It's an interesting claim. I don't think I buy it--the U.S. is entering our period of decline right now, and our belligerence is, if anything, accelerating that--but maybe you'll make a longer argument with examples on your blog.