bye bye stealth?

Here is an article claiming that defence against stealth is just around the corner

http://www.defense-aerospace.com/articles-view/release/3/137075/cassidian%E2%80%99s-passive-radar-detects-stealth-aircraft.html

Sooner than I thought it would happen, but if this is correct then what will be the value of stealth when F-35 becomes operational?