The only persons who may not want to enroll in Medicare Part B are those who have a group plan that has features better than Medicare Part B, and for which the group policy would be the primary payer. There is no penalty to wait until your group plan ends, to sign up for Part B Medicare. If you are an active duty service member and age 65, you could also wait to sign up for Part B.
For everyone else who qualifies, enrolling in Part B is reasonably priced and something you have paid into. Unless you have moral reasons against it, prefer private coverage, or are able to insure yourself, I know of no reasons to not enroll in it.
For everyone else who qualifies, enrolling in Part B is reasonably priced and something you have paid into. Unless you have moral reasons against it, prefer private coverage, or are able to insure yourself, I know of no reasons to not enroll in it.