Hollywood is fickle; your career can end pretty fast. If the acting jobs dry up, you have to have something to fall back on. In fact, that would be my advice to kids interested in acting - make sure you get an education too.
I felt that in time simple stone tools would be found in early Pleistocene in England.
Directing remains very psychological, and it takes a lot of time and reflection. When you're an actor, it takes less time, and you can express yourself physically.