[YaBa]

In theory yes, however, in pratical terms you just need to "bomb" the right places and 90% of the communications would be gone for quite a while. Think PIX and DNS root servers, destroy those, and only minor services would be available. There are countries with a single PIX, sitting in regular rooms without any kind of security, unplug those and the whole country would be offline (to be fair, intra-ISP traffic would work). And there's no need to go that far (bombing places), a bad actor that can cut some submarine fiber in the right places would cripple the whole world. Or just someone messing up BGP config in a big ISP, no need to bomb or destroy anything, a single bad command can cause major issues worldwide (had happened before).

[adrian_b]

The Internet as it is now is structured to maximize the profits of the Internet service providers.

This results in a structure very different from what was conceived originally for the purpose of being resilient to partial destruction.

For the latter purpose, the best structure is a decentralized mesh with mostly equivalent links, which is much less economical than what the Internet uses now, i.e. a hierarchy of links of increasing throughputs that concentrates the traffic into few very high-speed links that pass through central high-capacity routers, so that the parts of the network where most of the traffic is concentrated are very vulnerable and their destruction would affect everybody.