From my experience, at least in my area, very few witnesses watch these programmes. Only die-hard pioneers or elders although not all of them.
They started opening KHs in the area one Friday per month with the purpose that all those older members without internet could assist. In fact, all were invited to watch it together as another spiritual activity as a congregation.
After four months, the arrangement was suspended for low attendance. Most brothers aren't watching it and I reckon it's the American televangelist approach it has the main reason.
However, I heard it's having more success in other countries but don't think it has a massive success.