In fact, there is a lot of systemic bias in the Wikipedia. This is a reflection of systemic bias in society.
For example if you look at biographies notable men outnumber women, it's white and western dominated. The "Race and IQ" topic is still a big mess. But, you can tell from the boatload of citations and the 1GB talk page that it's a contested topic. I expect if the Wiki can endure the talk pages will be a huge resource for historians.
If we still have historians in the future.