Forerunner saga characters TO RETURN IN HALO 5?

For those who have read Silentium (and more specifically, Rebirth), you’d know that…

the IsoDidact, Chant-to-Green (the new Lifeshaper), and a few other Forerunners survived the firing of the Halo array 100000 years ago. They said they plan on leaving, basically saying Forerunners are no longer going to interfere. …However, if a threat to the galaxy becomes too great in Halo 5, could we see them return in Halo 5?

My theory is that we will see them return in the end (or, at least, in Halo 6).

What are your thoughts?