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While there certainly are technical threats to LO, that article significantly exaggerates the degree/timeliness of the threat.  LO will be critical to our continued success and will remain a huge force multiplier for decades to come.  If we just stood still in our capabilities, then yes, eventually networks around the world will eventually develop counters to our advantage due to LO, but we aren't.  Passive covert radar has plenty of hurdles to leap before it will become part of a system that can put missiles on LO targets, and it along with the IADS it would be a part of still have their own vulnerabilities that we can exploit/attack, too.  Like warfare throughout history, no single technology can remain dominant forever, but the end is not yet in sight for our current brand of dominant technology.