So make Sundays the same as weekdays and then in a few years time we can have a thread on here about how much money the railway is wasting in staffing and running costs by running a weekday service on a Sunday with a small fraction of the number of passengers paying for it.
Maybe where you are but round my way long distance and local services are as busy as they are during the week (and in some cases busier). Further, maybe it was just me, but hasn't it been widely acknowledged that Sunday is one of the consistently most busy travelling days on the network?