Nobody ever quotes any other reasons than the child seats... that's basically the only scenario where falcon wings are better than other doors. Nobody ever gives any other reasons.
The doors are slow to operate, they don't allow roofracks, they cause issues in garages, take headspace inside, they are difficult in accidents etc.
No, I doubt there is much future for them beyond perhaps some minibus-like applications where it might make sense to open up the side of a vehicle (similar to trunk access)... which Model X fails to do as third-row access was not helped in the final design...
Change needs to have a point. Falcon wings have very few pros and lots of cons. There is a reason why the gullwing idea has not caught on and why falcon wings need a lot of expensive technical trickery to try to avoid those issues.
Last month a somewhat overweight friend of mine commented that the middle row on my X were the easiest seats to get into in a car that he'd ever experienced.
The big opening makes getting in to the third row much easier, and it comes in handy when I need to put large things into the car, like the portable fridge/freezer I sometimes keep between the middle seats on trips.
So that's three good reasons that have nothing to do with child seats.
Given where Tesla is right now, it may be more important for Tesla that they are distinctively iconic, and draw the attention of everyone that sees therm, though that isn't necessarily a benefit to the individual user.
Random thought: there are more falcon wing doors in the road right now than all the gull wing doors ever built, I think.
Mercedes built just 1400 300SL coupes.
Wikipedia says less than 3000 Bricklin SV-1s were built.
Delorean built 8583 DMC-12s.
Suzuki built about 5000 of a tiny Kei car called the Autozam AZ-1 in Japan.
I'm having trouble finding exact numbers for the Mercedes SLS, but they sold about 2k gull wing versions in the US, maybe twice that world wide?
13 of the wacky Bristol Fighter Viper based supercars were built, and about a hundred Melkus RS1000s and a similar number of Pagani Huayra, plus a bunch of low volume kit cars and concepts.
By comparison, over 33,000 Xs have been delivered in the U.S. alone to date, probably over fifty thousand world wide.