Just to put things in perspective, remember that THE WRATH OF KHAN was supposed to be Nimoy's swan song as Spock.
And THE UNDISCOVERED COUNTRY . . . .
And "Unification" . . . .
For all we know, an eighty-year-old Quinto will someday be playing Spock Prime 2.0 in the blockbuster reboot 2009's STAR TREK.