Hello, being soccor mad myself i can understand why your boy is a bit upset. However, soccor is a big part of New Zealand sport, nearly every school in every town play it, i live in Gore of alll places, and they have several soccor teams. England also send out several soccor scouts a year to look at new zealand players, and let's be honest you have more of a chance over here of standing out than you do back home.
Your lad will be fine, who knows he might even enjoy a bit of rugby??? Hope your trip goes really well!!