Well its costing billions to keep the industry on self support so even marginal income is beneficial especially as we are running a lot less trains but still have the same resources from stock to traincrew to support. Car carriers maybe a challenge but given car manufacturing is well down as are imports im sure some suitable vehicles could be found.
Marginal income is welcome, so long as it is greater than the marginal cost. To get an idea of what is needed for that, have a look at the fares on the ‘Staycation Express’ on the S&C. Whilst that is a more expensive operation than many, it’s not that much more.
As for motorrail - there’s no market for it in this country at a fare that would cover marginal costs; those days have long gone. But let’s not make this yet another Motorail thread!