LeoAltair on "remove_action not removing action (on wp_widgets_init)"

Hi !
I'm trying to get rid of the default Wordpress widgets, as I do not use them. Since they are launched by
add_action('init', 'wp_widgets_init', 1);
I tried
remove_action('init', 'wp_widgets_init', 1);

I also use

add_action( 'init', 'other_widgets_init') ;
function other_widgets_init() {
	if ( !is_blog_installed() )
		return;
	do_action('widgets_init');
}

to launch all the other widgets, since this call is in wp_widgets_init.

But remove_action does not do its job ! The default widget are still loaded...

Everythings works fine if I comment the add_action in the core file, but I don't want to do it this way, I want to do the thing proper.

Why doesn't the remove_action do its job of removing the call to wp_widgets_init like the Codex says it should ?!