William Shatner wants to return as Jim Kirk in Abram’s Universe...
So? Marina Sirtis wants to return as Deanna Troi in future Star Trek productions. Michael Dorn wants to return as Worf in future Star Trek productions. I'm sure if you asked most of the actors who were in any form of Trek if they'd like to return, at least half of them would say yes. Doesn't mean they have a snowball's chance in hell of it actually happening.
And, seriously, what else are they supposed to say? "No, no, a thousand times no!"
Let's be realistic here. If some poor actor made the mistake of saying, "Nah. I'm done," the next headline would be: "So-and-So Turns Their Back on Star Trek!"
And we would have an endless thread about how they are sick of Star Trek and are letting down their fans . . . .