I'd be even more excited if the compiler were willing to execute complete heresy on my behalf and (with user consent) edit my source code automatically to remove unused imports. ;)
`gofmt -w` also already exists, it just (a) has to be run as a separate step and (b) doesn't have full cross-file understanding of the program.
Since we have version control now, I don't see any threat from an optional capacity for the compiler to destructively mutate the source as an optional feature. Let the same toolchain that converts input to output suggest improvements to the input.
