"You only think you love it." Feels close enough. ;)

"I'm not convinced people are static enough to love 'one thing' for 40 years." Who said anything about sticking with the same career for 40 years? As my interests have changed, I've changed my profession. My profession lags which is less than ideal but it's still worked quite well for me.

Why do you find it necessary to define what the general masses "really" want out of a career? It sounds like you know what you want and if you don't care to "DWYL" that's fine. That's you.