I never used Wikipedia for info since I was always too lazy to read around for one point that I needed, especially knowing something could be editted.
But you see, yes, nothing of value would be taken away. But, the easiest source of many things would be. Looking for pictures of simple characters, you tend to always see the pics from wiki first, for one.
Next, wikia sites would fall, aka, the fastest and most informative ways to find out about a fictional story character and etc.
And taking away Wikipedia also removes these wikias. Including one MADE FOR US. http://board8.wikia.com/wiki/Main_Page
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Official Pidgeot of the B/W Boards Clan
:D