Not unless they bring in portion working as we do already in the peak hour with some Brighton line trains attaching to mid Sussex trains at Three Bridges. They could send 8 car 387s up from Brighton to Attach to 4 car 387s waiting at Gatwick for them. The new signalling at Gatwick platforms 5 & 6 allows for this.
That's an intriguing idea - and might just work, if the incoming services are reliable enough.
But during the peak, they are virtually half empty and take up 4 useful pathways an hour, so i can see the positives of them running as a commuter train.
Don't get me wrong, I'm not oblivious to the capacity issues and constraints, but very few places in the world would consider giving up a dedicated airport link to alleviate a local commuter bottleneck. Given that demand for both air travel and commuting is on the rise, it needs some serious investment to fix - luggage racks on the trains is just not going to make much difference, really.
Isn't that what happens at Schiphol? Berlin's Airport Express is similar - a standard regional route that calls at the airport with airport and commuter pax mixing - mind you it only costs 3 to the city with the Airport premium (The airport station was been moved into zone C while the surroundings are B)
Is there a need for a premium Gat-Ex service? Gatwick is mostly low cost or holiday flights (even BA and Virgin operate different Aircraft configs with less premium seating then Heathrow based aircraft). I'm sure this sort of passenger would have no qualms about getting a normal train at normal prices (ie no Airport Premium) its not like Heathrow where there is masses of premium traffic.
Schiphol - horrendous airport, only been there once in the rush hour, just awful. Fortunately near enough to the city that taxi is affordable.
Berlin - gets a brand new airport next year, complete with new railway station that will be a major rail hub. So whatever they've got now, they plan on getting something a whole lot better.
1/3 of Gatwick's travel is full-service (Wikipedia so must be right.) The cost-sensitive part of the market can get the bus to London for £2, however road travel to London is painfully slow in the day, hence rail will remain a popular option for any category of passenger. If any airport expansion goes ahead, the second runway at Gatwick is likely to be high on the list, and importantly could be built quickly (by 2025) leaving the ground links bursting at the seams.