Trance has zero to little experience. If he is the plan moving forward with a new coach and another new offense that will be a catastrophe for him and his continued delayed development.
Just look at what happened to Mack Jones after having great rookie season. They changed his OC 3 times in 3 years and wonder why he went backwards.
If you are a new coach in Dallas with high expectations, you don't want to be tied to Trance, it will be a career suicide.
So regardless if they keep Dak or not, if their plan or lack their of, is to role the dice with Trance, they should 100% keep MM.
The only way MM is gone in my opinion is if they plan on moving on from Dak and Trance.