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'Dead' doesn't exist in the article, it's a (pointless) bit of editorializing by the submitter.

The article revolves around email having stagnated, which pretty nicely fits the "no longer growing" part.

Technologies that are no longer growing tend to result in cost-cutting, leading to engineers in the US and Europe getting laid off for offshoring. So "if it's not growing, it's dead" is actually a rather good approximation of the status quo.

yeah editors removed that (I shouldn't have added it).