The BBC's latest comment:http://news.bbc.co.uk/1/hi/world/africa/8602512.stm

South African President Jacob Zuma has called for calm after white supremacist leader Eugene Terreblanche was killed. Mr Zuma told the nation he was shocked by the news and urged unity. He sent condolences to the Terreblanche family. Police have arrested two farm workers who they say beat Mr Terreblanche to death in a dispute over wages. Mr Terreblanche's far-right movement is urging its members to be calm. It says his murder has political overtones, a claim the governing ANC rejects.
A wider BBC obituary:http://news.bbc.co.uk/1/hi/world/africa/3797797.stmwhich ends with this:
...he was still as much a master of the grand gesture as he had been throughout his ineffectual political career.
There maybe angry Afrikaner farmers and some sympathy amongst the fringes of the now inactive political right, but is this a "spark" for trouble? I doubt it, partly due to the long history of the political right, their inability to make inroads amongst the mainly urban white population and revenge aside what do they offer.

The government would be wiser to look again at the number of farmers being murdered, although I'm not sure if the murders continue at the pace of a few years ago. Long time since I have looked at these issues in depth.