'Anything happens'? As in, you feel that your interests may
change?
Let's just say this... do NOT follow according to what kind of jobs
are easy to find in the future, which industry is currently the
hottest, etc to consider what you plan to major in
university.
After all, it was only in the late 90s when the IT bubble was
building and computer geeks were in high demand. In the early 2000s
it was the biotech industry was the hottest in Singapore. And now
we have rumblings about Singapore not having enough
engineers.
Bottom line? Just stick to what interests you the most. Otherwise
you'll be screwing yourself for 3-4 years after you ORD, and quite
possibly you may end up screwing up your whole life as a
result.
If you're interested in political science, I believe Lazerlordz can
give you some advice in this area. If I'm not wrong, he's majoring
in this.
