We've really got to question the method by which someone becomes Sant in The Santa Clause. At the North Pole, Bernard, the head elf, explains that since he put on the dead Santa's suit, Calvin is now subject to "The Santa Clause" which means he's now obligated to return to the North Pole in 11 months and become the new Santa.
First of all, this is an argument that probably wouldn't hold up in court. All Calvin did was put on a dead man's clothes which, yes, is pretty weird, but also does not constitute a legally binding contract.
It's also a pretty strange way of getting a job. You'd think that plenty of people would want to be Santa and would volunteer for the position. Why coerce someone to take the gig? And what if the new Santa is someone who doesn't even celebrate Christmas? Does he still have to become the new Santa? There's also the fact that being Santa requires entering children's homes. Shouldn't the new Santa at least have to pass a background check?