Don't you think navies are getting a little outdated in their current form? I have to think going forward it's going to be all missiles and anti-missile missiles. Not saying that having a good missile defense won't also be expensive, but probably cheaper to have missiles based on the sea stead than having missiles on a destroyer floating next to the sea stead.

But honestly, it seems hard to really see a hot war between a Libertarian sea stead and a 1st world democracy. The 1st world aggressor would probably do the sanctions thing instead. Actual wars seem to be when one side is authoritarian or fascist or else religion is somehow involved.