How many years until General Direct Dialed telephony dies?

Discuss.

As I'd posted this poll a week or so back, general direct-dialed telephony, a/k/a PSTN (public switched telephone networks) seem to be in trouble. I think we could be within five years of their total collapse. And no, not just land lines (already about 25% of their peak in much of the US), but _all_ direct-dialed phones: mobile and VOIP included.

The problem, as I'd written before, is paradoxically the _low_ cost of calls. This is inducing tremendous volumes of junk calls, with one ...

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... appear out-of-sector, though I don't have any strong leads on where that might be.

Another possibility is that the extant PSTN might get its collective shit together. As has been noted (including in comments by @szbalint to this thread) the robocall and other issues plaguing the US aren't evident elsewhere, notably Europe.

Whilst I _do_ think that regulatory reforms might address the immediate problem (my vote: chargeback to the connecting telco for spam calls, with those then ...

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