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> run more exit nodes (which are depereately needed -- about 1k nodes for 2M users)

What is the ideal ratio of exit nodes to users? It seems that too close to 1:1 is going to be almost as bad as too few nodes, at least to my (not particularly well versed in Tor infrastructure) thinking.

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Thats a difficult question I'm not qualified to answer, and in hindsight that statistic was confusing. The real issue with the tiny amount of exit nodes in operation is a fundamental weakness in Tor; if an attacker can run a large enough percentage of Tor nodes (not necessarily just exit nodes), they can use traffic confirmation attacks to deanonymize users.

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