"All wires have some resistance. The larger the wire, the smaller the resistance.
Additionally, as any wire heats up, it's resistance increases, which will make the initial current drain reduce. Same as a light bulb. As the element becomes hot, it's resistance increases, therefore the current decreases "
you are correct in the strictest sense on this one. it is a series parallel circuit when you consider the resistance of the wires and connections.
that is my lineman training showing through, we are taught to consider only the resistance of devices. and not the wires connected to circuits because of the extremely high voltages i work with AND because the conductors are usually the size of your arm (not kidding!)
however, if you were to consider only the magnets as you suggest in a pure parallel circuit. there would be the same voltage drop across each magnet with only the current varying with the resistance.
the end result is the same, shorted magnet produces no braking. the remaining magnets get "some" current.
obviously the entire circuit would be in a state of overload at this point, AND adding a fuse would be a recipie for disaster if you were screaming up to a crosswalk full of kids!