I would have loved to see the game in Saturday, but I don't live in Miami so I could only go to one game. It should be interesting, being that it is the last friendly for them before the World Cup.
There definitely is more interest in soccer during World Cup times as many Americans support their team even if they aren't the biggest fans of the sport. It still has a long way to go before it reaches the popularity of the major sports like American Football and Baseball, but among the younger generations soccer is surging in population. There are a few teams in the lower divisions, below the MLS, that draw impressive crowds like Sacromento Republic and Indy Eleven (19,000 and 10,000 respectively). Every game for the World Cup is televised live on the major sporting networks (ESPN, ESPN 2, ABC), so it reaches a much larger audience than the MLS does.