You're entitled to your opinion, and that is fine. I understand those that do not enjoy the game. My frustration normally lies with those who say they don't like it because they don't understand it, yet they've really never tried to understand the game. You obviously do not lie in that camp.
It's easy to say "what does it matter?" but for some people who are intimately involved with soccer in the US, it is tiresome to see great, skillful athletes play soccer through their formative years, only to not see much, if any, future in the sport and decide to give up the game. Or, you'll see players decide not to play in high school or high-level club because their team is not fully committed financially to being successful, or does not have the public/administrative backing that is necessary to grow and develop a team or program.
I'm getting a little deep here, I know, but this is a problem that hampers the game in the US. You have many youth players who could have tremendous futures in the sport, but they don't want to move across the globe. Or, even more realistically, they don't want to have to drive hundreds of miles each week to practice or play for a worthwhile team because there is nothing closer to help them develop. In the US, the pyramid is backward compared to much of the world - the better coaching and higher level training and competition you desire, the more expensive it is for the player. That is opposite from all other parts of the world, where big clubs pay for you to be a part of their program. It would be nice to level the playing field in that regard, and another WC in the States would certainly help do so.