This is one only part of the corrective actions needed, the other half is improving regional mobility with trains to compensate:
The Dutch parliament is currently doing everything they can to help eurostar’s monopoly on travel to the UK by trying to solve the immigration and customs issue in Amsterdam, but they are doing nothing or not enough for all the other less flashy rail travel initiatives. In clockwise order:
If air travel is then still competitive and bottlenecked on slot capacity, connecting Eindhoven Airport by rail and moving more flights there could help.
I’m not an expert, but with the current implementation of EU policy I don’t think we will see improvements in rail connections that aren’t freight or the high speed core soon unfortunately.