What’s feasible and in-demand? Well, before anything else it’s an understanding of the basic principles of animation – regardless of what you want to animate. But if realistic, simple, and effective (emphasis on effective) is what you want, then I’d really suggest that you look into Wayne’s bootcamp course (after completing the core animation course if you haven’t already).
Yeah, bouncing balls will at first glance seem mundane and uninspiring, and that is a fair and valid thought. But once you look past the fact that it’s just a ball, you’ll realise that you can learn to translate what you’re learning onto anything else.
If anything, I think you should complete the first three chapters of the course which by the end cover spacing and timing – which as far as I am aware, are the most important principles to learn.
That’s my two cents, and I really think you should take me up on it.
Also Wayne rocks and I think he should be nominated for a melvin 😉