This particular debate is liable to go on until the cows come home, but to put in my twopenn'orth, correllation is
not causation. Passenger numbers were increasing
before privatisation anyway, and it's a moot point what difference privatisation made to this. The real success story, though, is freight. Ton-miles (or TEU-miles) have gone from a slight decline to a massive increase, although economic effects have caused them to level off somewhat recently. Again, I can't say whether that was the economy or privatisation, but the change is a lot more noticeable.
As for fares, I'm sure the TOCs charge what they think people are willing to pay. That's capitalism.
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Rail passengers numbers are increasing, rail investment is increasing, if it ain't broke don't fix it.
Back in 1991, BR produced a report called Future Rail: The Next Decade which said pretty much the same thing. It makes interesting reading.
http://www.railwaysarchive.co.uk/docsummary.php?docID=125