Quoted from Tribonian:Licensing Mark Hamill's voice from the Force Awakens for call outs will be prohibitively expensive.
Quoted from Rarehero:Says who? He does voiceover for a living...and even takes small roles in movies like Kingsman. He's a working actor, he's not unobtanium.
I think you missed the joke.
How many lines in The Force Awakens did Mark have?