Spoilers The Theories of DIS moving into the mirror universe Permanently

[Refuge]

They are not staying in MU. There is still the war to resolve and based on what we are seeing, Burnham is going to learn more about how the klingons are getting along with other races in the MU and use that information in the prime universe to put an end to the war.

I think 2 more weeks in MU then final 2 episodes back in Prime ending the war.

The other 'Discovery' will be winding up the war in the Prime universe, lol.

 

[Ronald Held]

Maybe the only reason to go to the MU is to drop off Mirror Lorca?

 

[Sir Stewart Wallace]

Burnham: "Your overconfidence is your weakness."

Emperor Georgiou: "Your faith in your Federation is yours!"

I can get behind this.