If your
brain is removed, and a new brain is installed in your
body, you have effectively
vacated the premises.
Were a brain transplant feasible, it would be more accurate to describe it as a body transplant. The brain "donor" would actually be the beneficiary of the procedure, in contrast to the usual transplant scenario.
One wonders if this might become an option, in the future, for people suffering from the catastrophic failures of multiple organs. Rather than hope for the availability of compatible replacements, one could simply evacuate their body entirely and take up residence in a new one. This raises, of course, the question of who exactly would be willing to donate his or her body to someone else and face life as a disembodied brain.
Let's get some extropians working on this.