It has. Google knows exactly what it's doing.
It's just that Google makes money from keeping you searching, not from giving you the right answer.
1. I don't necessarily know I'm looking for a wikipedia page. For example it turns out there's a Bogart-Bacall syndrome -- https://en.wikipedia.org/wiki/Bogart%E2%80%93Bacall_syndrome -- that would actually be a false positive, but it's definitely not the first time I've found there are interesting wikipedia pages related to the thing I'm searching for.
2. In general, wikipedia's search is worse than google's -- meaning that if I don't know the exact name of the relevant topic, a google search for <topic> "wikipedia" is more likely to hit the right page than a search in wikipedia itself.
3. Opening wikipedia first is more work than typing bogart bacall wikipedia in by browser's search bar.
Likewise IMDB (not that I'm fond of the site, if there were an alternative I'd switch in a heartbeat) -- if I search for "bogart bacall" then the top six results should be IMDB and Wikipedia for The Big Sleep, To Have and Have Not, and Key Largo.
How google hasn't figured that out in the past fifteen years is a mystery.