Often child actors (like Wil, for example) don’t actually want to be actors and it’s just overbearing parents making them do it. Naturally, for many of them, as soon as they reach adulthood and gain more control over their lives, they don’t continue a career in acting.

That's possible (although it is entirely possible Wil is misremembering what he said in elementary school to his mother). But I also think it's hard to make the transition. Who did it successfully?

Even Neil Patrick Harris needed a "big break" as an adult to get back into acting.