The Timeline has been altered, if Spock tried to travel forwards, he would end up in the future of this alternate timeline, not the future he left behind.
Not necessarily. Remember what happened in "Endgame" of Star Trek Voyager.
Nobody in ENDGAME traveled into the future.
Admiral Janeway traveled into the PAST, and successfully CHANGED THAT PAST, getting Voyager home much earlier than had happened in her personal history.
As for Spock going home, I've explained in another thread that this "creating an offshoot timeline" doesn't fly in the Trek universe. If you change the past, you've changed the past.
If the new movie does NOT overwrite the original timeline, then that means Spock and Nero must have ended up in a different reality when they went back in time. A reality that already existed alongside the Trek unverse we already knew.
It would be the past of THAT reailty, THAT universe, that Nero and Spock have interacted with, and changed.
If that's the case, if Spock can determine the quantum reality he came from and find a way to pierce the veil, he CAN go home.
If, however, the movie DOES take place in the Trek universe we've always known, then that universe has been changed, and the future Spock knew is gone.
There'd be nothing for him to go home to. Only a future where a wrinkled Quinto with pointed ears will say "You know...we really don't look exactly alike."
