sure, to avoid this problem (but makes it a pain for others) you can set that user as an undeletable user in the /includes/config.php file.
Find the line (around line 131)
PHP Code:
$config['SpecialUsers']['undeletableusers'] = 'xxx'; //where xxx is the userid
However, if you ever want to change anything in that users profile, you have to manually undo this in the config, make the change in the admincp and save it, then change it back in the config back to undeletable.