That is an interesting social commentary on where we are today. Back when the original was done, it was the cold war period. Not that a soviet invasion was likely but one could almost see that.

In today's political climate I just don't see any major threat in that same manner. China wouldn't invade. We already owe them alot. It would actually be counter-productive to them to do so.

Space aliens? Been done and still being done... Maybe it just doesn't need to be rebooted...