This shows a significant lack of understanding of what's going on and why he is as big as he is. The vast majority of why he is so big is for him to understand natural language. He isn't querying a database, but making relational connections like a real human does. I'd be willing to bet the actual space devoted to the trivia database is extremely small, especially relatively speaking. The only reason he is winning is because IBM did a very good job programming Watson to understand English. If you watched Monday's episode, they showed just how bad he was originally before the final implementation of the programs that allow him to "understand" English.
Uh, yeah I know whats going on and I wasn't impressed. Again, if it was smaller then it would be nice, but I expect a huge computer to dominate humans. Heck, if he was the size of a home PC Id still expect him to win.