I disagree. I think Ed should keep streaming in Open.
After all, Open is the mode Frontier are trying to get more people to play in this multi-player version of Elite; it wouldn't look good if Frontier livestreams were all done in a protected environment, free from the players who just like to "Or just hunt other commanders", as is what is in Frontier's marketing.
Ergo: Frontier should always stream in Open - they market the game as multi-player, they also keep trying to encourage everyone to play in Open, and seeing as livestreaming is a form of marketing, everyone should see what the game entails - warts and all - and if that includes being ganked at every opportunity presented to those players who "Or just hunt other commanders" - as it states in their marketing - then anything else would just be a misrepresentation of the game.
Regards