According to Dr. A. J. Schuler, author of Negotiate Your Way to Success, there are 10 common reasons why people resist change.
Common Reasons Why People Resist Change

Risk of change is seen as greater than risk of status quo
Connections to people disturbed – “tribal bonding”
No role models for new environment
Fear of incompetence or looking incompetent
Feeling overloaded, overwhelmed
Healthy skepticism
Fear of hidden agendas […]