It's been lamented that the time and expense to reinforce basic seamanship skills have been sacrificed for more intensive tactical training, which implies far greater reliance on electronic sensors and computers than ever before.  Even in the US Navy, there is no such thing as a limitless budget or limitless time. 

I suspect this accident will be attributed to something as simple as not following the "rules of the road" by failure to yield the right of way.  Publicly accessible resources now strongly suggest the USS John S. McCain was the vessel CROSSING a heavily used traffic lane, and therefore the onus was on its crew to avoid vessels transiting that lane. 

If true, then another Captain's naval career, plus the careers of all other crew members held responsible, will be flushed down the toilet.  We mustn't ever forget that shipmate's lives were lost and that drowning is far from a painless death.