Started windsurfing in '77 (back when Robbie Naish had just become a teenage world champion) and was addicted for a couple of decades. Now I can't be bothered unless the waves are huge. After several years kiting I can't be bothered unless the water is flat as a pancake. A real thrill? Try cancer cell biology. With a decent microscope (and a couple other tools of the trade) you can travel through the nearly unimaginable universe of a human cell, and learn what makes some survive and others die.
Yours is the best answer here and without a doubt the most balanced. I have many friends that enjoy both sports and most return to around the 80 ws/20ks ratios you refer to after the initial thrill of kitesurfing wears out. My friend from Binningup will take his kite when shallow flat water is on hand but prefers his windsurfer on the open ocean. I see no reason not to take up either sport if you have the resources and somewhere to sail.
