Short of completing rebooting the series there are only 3 ways for cyclops to appear In future X-Men films.
ays of Fuutre Past Is sequel to X-Men First Class,X-Men,X2,and the
Wolverine and Cyclops appears In future scenes
2:The time traveling In DOFP at end remove the Last Stand event from Cannon
and Cyclops Is seen alive at end of film In new post X2 future where events of
Last Stand didn't happen
3:Teenage Cyclops Is Introduced when First Class era films reach late 1970's
Ignoring the Events of X-Men Origins:Wolverine