A majority of Japanese respect our monarchy and Tenno plays a great roll as our mental comfort. So what is the mental comfort and what for?
I don't know if you know a popular and long-lasting, 35 years in TV, anime, Sazae san.ツ It is just about their daily life, nothing exciting happens there. No doraemon with its future items, pikachu or robots with high-tech weapons. Just a bit funny stories among cheerful characters. When I watch it, I feel a kind of nostalgia on something lost in my daily life.
It is interesting, at least for me, to think Prince Naruhito and Princess Aiko will act their historical/cultural rolls in the future like other Tenno did in the past.
I don't deny people saying that the monarch system is out-dated to justify social problems or that everything happens for reason and acting his/her roll as a devil's advocate. It might be true if we all would be rational people... So our tax on keeping our monarchy is just nothing, I suppose.