Star and Sony needs to exploit loopholes here. If Team India doesn't reaches finals or semi finals of any sport. Be it Cricket World Cup, Football World Cup or Wimbledon (lol). There needs to blackout on DD Sports.
Private broadcasters cannot do so and will not do so. Rights r bought for entire event so private sports broadcasters have to carry all matches. Blacking out is impossible as not only it will create issues with respective sporting body, lead to complaints from viewers but also cause revenue loss for broadcaster.
Even if they decide to not carry certain matches still they would have to share same with Doordarshan.
Only thing doing such an act will cause is that reputation of broadcaster will b immensely damaged and broadcaster isn't gaining anything by blocking matches