Reddit was once a small site, and it grew out of Digg's demise. And Digg grew out of Newsgroups by adding the voting option. If Reddit does not serve a purpose, another site will. It might take a few months, but there is no demand that is left unmet if the tools exist. Saidit is in a good position to grab the disgruntled mainstream users, while Voat has just already monopolized all the rightwingers because they were the first to be kicked out of Reddit and it was the only alternative then.