Getting rid of TOD should be the next step, it will free station TVM's and Booking Office Windows up for the bulk of people who want to have orange tickets bought on the day as their infrequent travelers.
At Sheffield, the queues at the collection-only machines are almost invariably longer than the queues at the TVMs which are signed "Buy Here". At the times I am there, the latter often have no queue at all. So there is no need to "free up" any TVMs for on the day purchase.
Obviously the situation will be different at some other stations, but the solution there is to provide the number of TVMs needed to satisfy the demand, not reduce the options available.