I just thought of this, and I want you to view it from your own perspective. As everyone hopes that more people get to believe and use bitcoins, I think bitcoins can gain more new users on a large scale if anyone (whales ) can place their advert through a popular football club just as some companies do sponsor football league. I think this will send a strong message to billions of people across the world who do know but does not embrace Bitcoin usage.
Let me site another example, let's take for instance, a club announces that they will pay their players in BTC. This news can also help people adopt BTC.
Bitcoin is quite well known throughout the world, even in countries that still prohibit its use, but unfortunately, more people consider Bitcoin as an investment asset rather than currency, so when there is a company that advertises about Bitcoin at the stadium, they will introduce more about the company than about what are Bitcoins.
Meanwhile, regarding the use of Bitcoin as for salary payments or so on, that should be developed so that gradually the goal of making Bitcoin a digital currency will be achieved and not just as an investment asset or exchange trading currency that provides benefits because of its very agile price movements.