life expectancy 40 year old male UK
GOOG YHOO
nathan name
president of nigeria 2004
weather seattle christmas day 2008
microsoft
ethnic groups nigeria
With the exception of Microsoft, none of these are questions I'd see myself typing into Wikipedia. Some of these might have tangential information available on Wiki, but this is not Wikipedia's meat and bones.
Wolfram Alpha is not going to kill anything. It provides a new kind of service, and if it becomes popular the only deaths will be of those services that offer very limited value to begin with.