First of all there is little information available about wilkiasari except that, it will use user/community input to generate search results which is different from what Google for example does –Google basically uses algorithm to create search results without human interaction. There have been several attempts before also to generate search results based on user ratings or user bookmark data etc but none has been successful to beat algorithm based Google results. It is widely accepted fact that user/community input based search engines would be better than algorithm based search provided someone gets the right way to use user/community input. It is like an open secret that everyone knows but no one knows how to get it right, there are lot of examples like everyone knew digital music players (mp3 players) is big thing many attempted to enter that space like creative, Sony etc but it was apple with ipod and itunes that got it right and was successful.
I think wikisari might be the search engine that will finally get the right way to use the user input ,the reason for my thinking is simple that its founder knows really well how to use community .If there is anyone who can get it right it would be him his records speak for itself when he started wikipedia people questioned that how can user generated knowledge be equal to Britannica were the content is generated by professionals but he showed the way and now wikipedia is accepted as trusted place to find information .
So in short Wikisari with right approach and right people driving it now has the real chance to be a Google killer.