Your last sentence represents a mealy-mouthed way of demanding continued cross-subsudies for economically unviable parts of the network. It also embeds previous decisions, no matter how flawed, and indeed in my view makes future reopenings less likely. If you know that if you try and it doesn't work you will be lumbered forever then not trying looks a better option.
There's nothing mealy mouthed about it.
Cross-subsidy is absolutely essential to provide a useful transport network. The old pre-grouping knew this as much as anyone.
In terms of your second point, I don't know whether the Speller act is still on the statute books, however it directly addressed exactly that issue.