Adding Latest jQuery in Functions File

In researching this, I found this thread – http://wordpress.org/support/topic/linking-to-jquery-the-right-way – which demonstrates loading jQuery from Google in the header:

function add_google_jquery() {
   if ( !is_admin() ) {
      wp_deregister_script('jquery');
      wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js', false);
      wp_enqueue_script('jquery');
   }
}
add_action('wp_print_scripts ', 'add_google_jquery');

What I would like to do is always load the latest jQuery which can be obtained here: http://code.jquery.com/jquery-latest.min.js

So, if I alter the above for the functions.php to this:

function add_latest_jquery() {
   if ( !is_admin() ) {
      wp_deregister_script('jquery');
      wp_register_script('jquery', 'http://code.jquery.com/jquery-latest.min.js', false);
      wp_enqueue_script('jquery');
   }
}
add_action('wp_print_scripts ', 'add_latest_jquery');

…will this work in the functions.php?
…and is this a good idea or a not, and if not, why?