Throw this into your functions.php:
function clear_yoast_metadesc( $metadesc ) {
return '';
}
add_filter( 'wpseo_metadesc', 'clear_yoast_metadesc', 99, 1 );
If you set the $metadesc to empty like that, it won’t be echoed. BTW, bulk editing is very hard on my to-do list, so you would be able to switch back completely 🙂