A single point of failure and avoiding that is the whole point of Tor?
Tor has a huge problem of not having enough nodes. And especially out-nodes.
Current out nodes are corporations with good leaders, universities, clubs that finance lawyer costs and people that route everything into a vpn.
Of course the later is a huge compromise. But if anything goes wrong it's still the person that routed to the vpn that's got the problem. So: point of failure? Yes. Increased number of nodes? Also, yes.
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