Re: FOX Shared Universe
It's pretty clear now that some people want the original cast back for good and others want fresh blood injected into the franchise with spin-offs like X Force, etc.
We'll have more certainty when DoFP is released. If that is an obvious fond farewell to the original trilogy cast, then we can close that door. DoFP might end with McKellen's Magneto having died, and god knows who else, and the time-travel corrections might not be shown as fixing all that.
Until we see how DoFP plays out - and how it is received by critics and the audience - we won't know for certain. The studio/producers may have some ideas for the future but they will have to wait to react to the box office of DoFP.