Immediately, the actor was filled with utter terror. He explained the sensation as feeling like he'd been drafted. And he's not exactly wrong. Whoever became responsible for Luke Skywalker being left out of the movie was basically committing suicide-by-angry-nerd.
Hamill's admitted reaction upon learning he would be a few million dollars richer.
Hamill, ever the kind farm boy, needed someone else to do the dirty work for him -- someone like a brazen smuggler, perhaps. In an interview on the Nerdist podcast, he admitted that he was crossing his fingers and hoping that Harrison Ford would say no first, which seemed like a realistic possibility, given how much he freaking hates Han Solo. Unfortunately, director J.J. Abrams made the movie irresistible for Ford by offering to kill his character. And so Hamill accepted mostly out of politeness, The Force Awakens was a success, and he ended up being in it for like ten seconds. Good luck on the next one, Mark! Hope it doesn't suck!