Is it time to seriously start worrying about Kessler Syndrome (https://en.wikipedia.org/wiki/Kessler_syndrome https://en.wikipedia.org/wiki/Kessler_syndrome)?

Is it time to seriously start worrying about Kessler Syndrome (https://en.wikipedia.org/wiki/Kessler_syndrome https://en.wikipedia.org/wiki/Kessler_syndrome)? The individual satellites might degrade relatively quickly, but a collision cascade could make the system unfeasible for years at a time and a certain percentage of the garbage would be kicked into higher orbits.