The drop off charge ( which is similar to LHR, LGW & STN ) is still good value if a family of 4 vs DART prices.
It is a choice.
It would be a good thing seeing less cars in CTA and more arriving by public transport.
As planes are getting larger with more 321s coming online the pax cap becomes a good argument to increase.
Airlines are moving to more LEAP technologies for better fuel and noise so argument for limitations on pax should be relaxed if they meet these controls.