A few years ago, in a wargame predicated around the persian gulf, this retired marine who was playing the bad guys launched a low-tech attack on carrier groups which consisted of a ton of drones and fishing boats filled with high explosives. He won.
Result? They did a "redo" with a new rule that he can't do that stuff. Because carriers are awesome and admirals want to command them.
The good news is that, at least at the time, we still had someone like General Van Riper on our side. If you look at military history, many major wars have an opening stage where outdated doctrines are conclusively beaten and the military suddenly gets really interested in out-of-the-box thinking.
I'm not convinced we're better off for it, unfortunately. Read 'The Guns of August' sometime, it's very instructive on just how many people need to die before the generals start changing tactics.