If a curve is built near Carnforth to join the WCML and little NW lines, through traffic from the West Riding to Carlisle (and beyond) could be catered for, and stops at Oxenholme and Penrith would be more useful than calls at existing stations on the S$C line, which serve tiny communities. While I do not wish the S&C line to close, its retention is not essential, nor is retention of the Clitheroe-Hellifield line. A stub siding could be kept to serve Arclow quarry.
Sadly from a rail perspective, over the last 12 months (with full Brexit and the financial consequences of the Covid crisis) railway finances have become much more challenging and some pruning may be unavoidable. In such a climate, expensive-to-maintain lightly used (often rural) lines, not serving significant populations, are particularly vulnerable. The West Highland extension, Kyle of Lochalsh and Conwy valley lines are similarly at risk.