with a large amount of the nodes under LEA control .It would be possible to work out traffic patterns and IP's of users ,but not in real time
add in DPI on the lightly encrypted traffic to determine what it is ,and after a bit you might be able to "connect the dots" and match up ip's with data .
but really the only people that might be able to do this is the state
but this here is REALLY the PROBLEM !!!
Quote:
DEA and NSA Team Up to Share Intelligence, Leading to Secret Use of Surveillance in Ordinary Investigations
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https://www.eff.org/deeplinks/2013/0...nce-laundering