That will probably be postponed
I was hopeful of that at first and even suggested that there could be benefits running the two side by side for some time.
However Henrik seems to believe that this would go against the one persistent world idea and he seems to be sticking heavy to the idea of shutting it down as soon as MO2 is 'released'. Which I kind of get. Personally I think there could possibly be an exception here though since they are at different times in history. At least until a conflux actually happens again.
If you are talking about the release of MO2 being postponed then that is a pretty good possibility since it still lacks very many features. But again, Henrik seems to be suggesting than MO2 is going to be released with limited features and grow from there.
But regardless of the possibilities of MO2 releasing later or MO1 shutting down later, we can only really go by what they have stated multiple times.