This sounds rather like the "short DMU" issue, which is "not on" as it wastes line capacity.
It also isn't very effective. Take the service from hourly to half-hourly and you will grow demand substantially. I long took the view on the south WCML Southern services that, to solve the overcrowding issue, it would be necessary to go to 8-car hourly *or* 8-car half-hourly. Of course 8-car hourly was chosen and there isn't the overcrowding issue any more, but the point is that a step from hourly to half-hourly is a significant upgrade and will bring a *lot* more extra passengers.
I would like to see a half hourly service on the LNR Trent Valley runs, including one of the two extended to Liverpool (I know the DfT don't like that, but they need to wind their neck in). However, that half hourly service will need to be 8-car, too - so can't run via Stoke unless it doesn't serve the local stations.