Are a large number of people actually interested in sports, or is it a large number of people within your filtered and biased social group that are interested? If I look at what my friends watch I'd get the impression no one watches sports or soaps and everyone would like the TV schedules to be filled with documentaries and satire. That doesn't make it true - it's just that's the sort of people I socialise with.
I'm not saying you're wrong, just questioning whether you've done enough actual research to know if this is really the case.
I'm not really debating the popularity of football. Here in the UK it's popular - I'd guess that about 30% to 50% of adults watch it regularly (in a pub or going to a game), with maybe 1/4 of those being interested enough to pay for a TV service to watch it at home. It definitely isn't even close to "all middle to upper class families" as thegenius2000 suggested might be the case in Kenya though.
An interesting related statistic: Almost twice as many people go to the theatre in London as go to all the major Premiership football games[1]. I doubt many people would guess that if they were asked.
I'm not saying you're wrong, just questioning whether you've done enough actual research to know if this is really the case.