Wolverine meets with Young Xavier, Magneto, Mystique and Beast 31 years before X-Men Events in 2004. This alone prevents Everything.
(alternative image link - http://s22.postimg.org/s2404a6v3/XMENTIMELINE.png)
1)Wolverine will have bone claws - Wolverine: Origins event is prevented.
2)Wolverine half-brother Victor Creed is ALIVE(Prevented X-Men)
3)Stryker is alive(prevented X-Men 2)
4)Because everything else was prevented and changed - X-Men 1, 2 and 3 never happens - Jean Grey and Cyclops are alive
5)Wolverine Japan - never happens
Now the real question is...
Will Wolverine stuck in past, or he changes past and time travel back to future?
If Wolverine stuck in past, they can make at least 3 more X-Men movies without (Patrick Stewart and Ian McKellen - THEY ARE TOO OLD) and fix the timeline. If Wolverine travels back to future(2023) then they have to make future world and we have most of the story missing because Wolverine Origins, X-Men 1,2 and 3 are all prevented. Now what? Magneto and Professor X are best friends now and dying because of old age?
Bryan Singer teaser: " As a result, we have parallel action, and there's underlying tension because there's always that threat Wolverine's consciousness could return to the future and leave the world in an even darker place."
Because its huge time leap from Last Stand and Days of Future past, this alone makes all characters older.
What you want?
A)Wolverine stuck in past - See new timeline, Victor Creed story, Stryker story, more of Younger X and Magneto and his team story, more of X-Men crew and school.
or
B)Wolverine comes back to future - Everything continues in future, ignoring Victor Creed, Stryker and past events story, more of continues after Future, new mutants.
or
C)Wolverine screws up past, return to the future and leave the world in an even darker place.
Do you guys want A, B or C Scenario?