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You blame the decline of the slide rule on the PC, then follow the slide rule with the true cause of its decline, the pocket calculator.

As for modems, they're still out there, but possibly not for much longer. Every major retailer I've supported over the past years still has at least one 56K modem, either as the backup connection during network outages (although some are starting to use 3G or 4G for the backup) or for remote access by net ops.