The last good stream Frontier did was the one about the various sounds they use, that one got a lot of praise and it wasn't about new stuff, it just actually contained something of interest to the average ED player. If their streams were more carefully thought out and presented, even a history about David Braben's life in the games industry would be well received, and if that meant one video every couple of months, i think people would still prefer that, EVEN if there was no new content reveal.
Regarding the Youtube comments, yeah i hope they don't even bother reading them, because as you say they are doing their best with what they are given, which just like what we've been given, aint much. Imagine if you had to turn your own ED session into a livestream, lets say tonight. 'OOOOKK here i go,......out the slot there............hmm forgot my limpets....20 mins later OOOOOOKKK here i gooooo.....' when you think of that, they're doing really well.