Boycotts are only worthwhile by people with the boxes that record viewership. Across the country only a few thousand households have the boxes, and these households contain in total 11,000+ viewers. The figures for what they watch is extrapolated for the whole country. Therefore, each viewer with access to a box represents 5,000 people.
If anybody other than these viewers turn off, the viewing figures aren’t affected- even by as much as one. I showed a link to wikipedia in a recent article.
Heres something better. Try to convince as much people to stop giving money to pay TV and sky. Then maybe these accursed services will disappear and people will be able to watch their favorite sports in free air TV.