Hide Native WordPress Thumbnail Meta Box

functions.php

<?php
/*
 * Hide Native WP Thumbnail Meta Boxes by Page ID
 * Note: I really should switch this to check page template, not page ID
 */
function hide_native_thumbnail_meta_box() {
  // Store our page ID's 
  $excluded_page_ids_array = array(6,91,225,84);
  // Get Post ID
  $post_id = $_GET['post'] ? $_GET['post'] : $_POST['post_ID'] ;
  // Check current page against our array
  if( in_array( $post_id, $excluded_page_ids_array ) ) {
    // Remove if match
    remove_meta_box( 'postimagediv', 'page', 'side' );
  }
}
add_action( 'admin_head', 'hide_native_thumbnail_meta_box' );
?>