Disable the WP Editor on Page Templates

<?php
add_action('admin_init', 'hide_editor');

function hide_editor() {
    $post_id = $_GET['post'] ? $_GET['post'] : $_POST['post_ID'];

    if (!isset($post_id)) {
        return;
    }

    $template_file = get_post_meta($post_id, '_wp_page_template', true);

    switch ($template_file) {
        case 'name_of_page_template_file.php':
            remove_post_type_support('page', 'editor');
            break;
    }
}