The 5s is nothing more than a 5, I'd imagine that 'body swap' will become a future trend. Just look at the other phones available when your contract is up, if Apple still looks the best, just get a 2 yr newer iPhone and be done with it.
It's hard though, because Android upgrade cycles are all over the place.
Did you accidentally land on this site while falling off your horse?
How did you know I ride horses?
Did you fall and land on your Android?