As a soccer fan I found this audio background sounds as part of the celebration.
Since soccer is still remains marginalized in USA, this is a minor inconvenience for USA viewers that did not get filtered audio. Since Soccer World Cup is a tournament that is only played every 4 years, in my eyes it is not a significant issue.
USA TV broadcasters need to become more aware of every intrinsic detail required to broadcast a sanitized version of every sport. Since it appears that most TV viewers do care too much for the front-row live experience!
Well, you caught my attention with the tagline about the FIFA World Cup providing a venue for millions of people worldwide to get a (slight) education on audio and acoustics. Yeah, to an EE, a notch filter is a no-brainer for such a narrowband interferer as the vuvuzela. As far as soccer (sorry, that's football to the ROW) goes, I'm not a big fan, but a lot of my coworkers are, and I found it more entertaining to watch them than to watch the game! (Since my employer, Broadcom, makes chips that go into DTV's, we have many screens scattered about our campus, and some especially large ones set up in the cafeteria during the World Cup). The expressions on their faces and hearing dozens of people shout, "Ohhh!" at the same time was priceless!
On the very first day of the World Cup, when I watched part of the broadcast, I felt like the broadcaster was going to have to very quickly come up with a solution for the vuvuzela problem. It took them awhile, but they finally did.
Nice to know that a sports series and the traditions of a particular nation's fans could make such a contribution to the appreciation and understanding of audio engineering by so many non-engineers!
I must say that I was surprised at how long it took broadcast audio engineers to figure out how to attenuate the contribution of the vuvuzela from the 'ambient feed' coming out of the stadia. I didn't get around to checking out the sound on an FFT analyzer - believe it or not, I had better things to do on work days than watch the football - but it certainly sounded as if most of the energy was concentrated around a particular tone. putting in fairly gentle notch filters at the tone and the first few harmonics would be an obvious first step. A particularly easy way to achieve this would be to sum the signal with another version delayed by 4.26ms. This sum has nulls in the response at 235Hz and multiples - though perhaps not broad enough to eliminate everything.