If the North TPE timetable is a problem, why should it be the long running through Liverpool to Scarborough service that is sacrificed, rather than the new Manchester Airport to Newcastle.
Secondly, if ~20 minute frequencies are fine for the WCML between London and Manchester/Birmingham. Why can the same philosophy not be used on TPE. Drop one of the express services, but make them clock face between Manchester Victoria and York. I we really saying that the unreliability caused by that 4th fast TPH is worth it to stop people waiting 5 more minutes.
The Newcastle to the Airport service is technically a reinstatement; its loss a few years ago was keenly-felt in the North East.
I don't think that many would bat an eyelid in Newcastle/Durham/Darlingtonn if a direct to Liverpool were to be dropped.
I'm also not all that sure that many are all that bothered, in the short term, about two trains per hour from the North East to Manchester. The priority is dealing with the other problems affecting rail travel on the route; principally the availability of well-priced tickets and getting a seat. If staff shortages are an issue, then I think doubling-up on an hourly service to and from the North East would make far more sense.
Reviewing the ticketing landscape could make another contribution if Newcastle directs to and from the Airport are unfeasible at the moment.
Currently, the ticketing system conspires to force connections at York and Leeds. No-one with luggage wants to deal with those zoos with platform changes, bridges, subways etc. Advances and promoted connections at Northallerton and Huddersfield would make far more sense, with no platform changes and reduced chances of misconnects.
It wouldn't wholly make up for a loss of an Airport direct, but it could make things an awful lot easier.
It also still wouldn't address my question earlier as to why TP services are currently even losing time on clear ECML runs.