The trolley-problem is interesting in that it's a very simple way to show how most people's morals are not based on some framework like consequentialism (any flavor) or deontology or virtue ethics or... but are based on some vague intuitions that are not very consistent - with the ethical frameworks used post-hoc for rationalization.

The problem could be complicated (made more realistic) by adding unknowns, probabilities and so on, but would that bring any new insights?