Spock and Nero could have travelled to the future instead of the past. They could have done the exact same plotline, just with a different crew and ship in the future.
Both came from the future and as a result, altered the timeline & reality for Kirk & co (to use your perception of the past).
For an allllllmmmmmoooosssssttttt exact explanation, i'd have to recommend you (at a minimum) Voyager's episodes Year of Hell or Relativity.
I'll leave the remaining reveals to Star Trek XII (as announced by Paramount)... if only to please the continuity proponents.
I am familiar with both episodes (and most time travel episodes). I'll try to phrase my argument in that context.
Let point A be the year 2387. Yet point B be the year Nero arrived in. Let point C be an indeterminate time in the 25th century.
Nero and Spock travelled from point A to point B, creating a divergent timeline. (They might have also travelled into a different universe, but that's not helpful for this argument.) This is like what happened in that two-part Voyager time travel episode (can't remember) where they go back to present day- they introduce Captain Braxton here.
However, in my theoretical universe, they could travel from point A to point C (the alternate universe works here if you will as well.) This is like what the villain of that aforementioned Voyager episode did. He wanted to go into the future and claim technology. Or it's like how Braxton brought Seven into the future to help fix the timeline from there.
So Nero and Spock could create a divergent alternate universe in the future as well, but it would diverge at that point, not earlier, and wouldn't overwrite anything. They could do a similar story.
@minor race: so you mean a setting after/during tng/voy/ds9? that would harldy be a reboot, actually it wouldnt be a reboot at all, it would just be a continuation of things already done. tng wasnt a reboot, tng was successor of tos, because it simply followed an already laid down path (it's called reboot for a reason)
imagine if the movie would have been set during the tng-era and suddenly everyone has new costumes etc, a comepletely new and young crew (which wouldnt fit normal trek at all), much more flashy effects ("wat? where are my phaserstrips and my red torpedos") hardcore fans would cry havoc and complain about continuity-issues. at the same time it would seem to everyone else that this is the usual star trek, not very appealling to mainstream crowd.
i think, to reboot the franchise they've chosen the most logical point, the point where it all started - tos.
I'll respond to your points in a list.
1. I didn't want it in TNG. I wanted it beyond TNG. So why are you imagining it set in the TNG era? I'm talking about a third era (ENT can be considered part of TNG) that would be created as a result of the new movie.
2. It would be a continuation of things already done, yes. But you go on to say people would complain about it as if it was a reboot. Like some have done about TNG, no? So...
3. They didn't have to use the same actors. The actors were picked because they were to play a young crew.
4. Flashy effects would be fine 200 years from TOS. If anything, they make less sense in XI because we know things were less flashy then.
5. Hardcore fans have been crying havoc about canon issues since TNG and probably earlier. There are some people whose definition of Star Trek stops at TNG, some sooner, some earlier. Some likewise approach it from the other end, starting at ENT or VOY, and many will soon approach it starting at the new movie and nothing before (possibly, anyway.)
But how would they cry about continuity issues? The future's been mentioned in a lot of episodes, but probably less than a season would be applicable (because of all the timeline changes) to anything set in the 25th century up to the 28th century (29th and 31st are slightly better defined.) There's no continuity, and any that there is could be worked into it.
6. It could be not "normal Trek" if it took place in the future.
7. Then your definition of reboot differs from mine. I don't think they stand to gain by erasing or overwriting. They could expand and add without using an alternate universe. This would satisfy anyone.
Or, I don't see how it wouldn't.
Your points seem to be dealing with TNG, as if 'era three' would be like TNG. But compare TNG to TOS- they are pretty different.