Is it wise to change my supervisor in the late stages of my PhD?
There is no harm to change supervisor if he is not supportive nor encouraging nor friendly. Because in most of the cases, he is the only person whose recommendation you need to get your next position. So first of all, think how much of your present work can be added to your final thesis if you change a supervisor. If you can add more than 50-60% of your present work, then it would be a great decision to work with another good supervisor who is really supportive and interested to work with you. It is not a good idea to change a supervisor, if you plan to do everything from scratch again as it is already passed 3 years.