I would like to know whether there is a way to get numbers on those users enabling cookie blocker. As far as I know Google Analytics is tracking you by creating cookies. Is there a way to assess the quantity of those using cookie blocker or exploit other questions related to this topic?
Yes, depending on your site you would use a scripting language e.g. PHP, and attempt to save a cookie. If it doesn't save, +1
Here is a solution using PHP http://stackoverflow.com/questions/5859333/how-would-i-test-if-a-cookie-is-set-using-php-and-if-its-not-set-do-nothing