There are gazillion search engines out there and 99% are failed projects. Thousands of dollars gone down the drain.
What do you think it will take for a SE to beat Google?
If another Search Engine offers as many services as Google- Gmail YouTube etc there is a slight possiblity.
The reason Google has You Tube and Gmail which are projects in BIG loss are to keep people using google search- indirectly adwords- that is where the money lies for them.