Spoiler:
look how many times in the Stargate franchise they've changed the future in some way on the original timeline without alternate universe, the future has been written several times:
1. - 1969 - SG-1 - shows the present happened long before.
2. - Window Of Opportunity - SG-1 - every action Jack & Teal'c placed could have stayed with them if they stopped it.
3. - 2010 - SG-1 - changed the whole future with the Ashen.
4. - Before I Sleep - Atlantis - Weir going back 10,000 years when everyone drowned cause no one was there for the failsafe.
5. - Mobeius Part 1 & 2 - Changed the future then back with a bit of change, fish in jacks pond and them never going back in time in the first place.
6. - Unending - SG-1 - everyone growing old and dying and just undid it, cause there future would have been death.
7. - The Last Man / Search & Rescue - Atlantis - possibly what i mentioned before, we'll find out.
so i'm sure the mckay and keller kissing scene as shown in the previews for next week, in the end of the season premiere wouldn't even have happened like the daniel and vala scenes never did.
Spoiler:
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