Most people ARE intrinsically motivated. It's just that in this society, the things you do for intrinsic motivations are called "hobbies" or "play".

Hobbies are basically non-job things to get good at that don't pressure you with an economic sword of Damocles.

In a Basic Income world, essentially, ALL jobs are hobbies. Those that suck too hard to be hobbies had better automate.