Normal websites are going to be unaffected in terms of user-facing functionality, regardless of whether they use the data gathered from HTTP Referer internally.

Normal websites are going to be unaffected in terms of user-facing functionality, regardless of whether they use the data gathered from HTTP Referer internally. On the other hand, badly designed websites that do depend on the HTTP Referer to provide functional user experience are going to lose their users in favour of normal websites, because they are "broken"—and always have been.