To be fair the landscape of NZ was highly suitable to the filming of a Movie like the Hobbit. There were far better reasons for them to be filming there than the Dotcom case. Enough better reasons that it's reasonable to conclude the timing in the case was coincidental.
I suspect that it's also not unusual for Hollywood to sweeten the pot when they want to film somewhere with donations of various types.
The connection between the case and those films is extremely tenuous.
It is a bit unusual for Hollywood to get laws passed in their favour in foreign countries - http://www.theguardian.com/business/2010/oct/31/warner-bros-...
if you want to think the US industry most interested in the copyright law there moving all that money at the right time is just a coincidence, suit yourself.