I like to think of it like a zoo exhibit, come and see the orangutans. The royals have no real power in our society, and I'm sure every party has legislation prepped to abolish the monarchy if they ever try anything other than what they're told. So long as they keep bringing in more money than it costs to feed em I can see keeping them around.

That being said we should start working on removing them from government ceremonies like this. Why not swear to the people, or on the charter or something.