Not everyone will agree on the change. Keep in mind that these types of feelings are normal as people generally do not enjoy change and are sometimes made nervous by it. You will likely encounter pushback and resistance by a number of team members. Provide facts and data to show why the change is happening and reassure them the need and benefits of the change. These types of individuals are best suited to be educated about the change with information.
If you are encountering an extreme case of pushback, provide them with some choices that still fall within the spectrum of the intended change. They should then feel more involved in the process and it will help alleviate the negative mindset they may be experiencing.