Just challenging your claim that the line serves "the entire West Riding of Yorkshire", which is optimistic to say the least.
It would be overly optomistic to say that the whole of West Yorkshire uses the route. However, I certainly wouldn't be surprised if a large proportion of passengers on the train North of Settle are from West Yorkshire. That's certainly the case from my anecdotal observation - most are on there from WYorks with a fair chunk getting on at Skipton and Settle as well.
I would say that my anecdotal observations hold rather more water than basing the claim that the route is a basket case on the size of the populations of Settle and Appleby (as one poster on here is trying to) thus ignoring the existance of passengers from South of Settle.
If you didn't personally use the line, would you make exactly the same arguments you've been using?
A lot of your assertions can't be disproven without access to the ticketing database (which is strictly controlled) and conducting a full piece of route analysis. That's a 5-figure fee from a consultant. It's not surprising people posting in their spare time aren't showing you the case. But just because you haven't been shown the data doesn't mean your experiences of personal travel are automatically the full and accurate story.
Well you haven't even defined what a "basket case" is, and as we don't know that and we don't know the detailed analysis anyway, we're not much further.
If your data is telling you that most of the trains on the route run around empty, your data is wrong. I'm not going to take vague assertions from unpublished consultants reports that the trains are empty when this contradicts my own experience.
If I didn't personally use the line I probably wouldn't have had the experience of sharing the train to back up my views. However, I would have more faith in the observations of regular passengers than of vague and unsubstantiated consultants reports for which we don't even know the terms of reference.