Originally Posted by Marv
The event of 1973 gave birth to the events of the original trilogy, the Wolverine films & the present of Days of Future Past. The time traveler's actions as he or she goes back to 1973 will forever change the events of the original trilogy and the Wolverine films.
Days of Future Past at the end of the day is still First Class 2. The next X-Men film will most probably continue the story of the 1973 ensemble.
You're missing the point. In the original trilogy North America was not on the verge of a Sentinel take over. There was no reference ever that some horrible event had happened 30 years earlier that made life much harder for mutants. In fact the first X-Men made it seem that the existence of mutants had only recently been revealed to the public. In First Class the government wasn't even aware of the existence of mutants.
I find it really hard to believe that 10 years later an "event" happens that mutants are blamed for and then the reprisal incubates for 30-40 years.
So I still think that it's more likely some one out of time changes the past. Unless the cause of the bad future was the events of X3 and then someone goes back in time to stop Jean Grey from being born or stop Worthington Labs from being created...