I think the streaming has to be sustainable, as with simulcasts (as opposed to streaming catalogue titles already out on DVD, which also needs to happen), there's a lot more skittishness from Japan and a lot more problems with people just forgetting or losing interest by the time a show has plodded onto DVD via all of the necessary contracts and preparation. I know that comments such as, "meh, I don't even want ______ any more after waiting six months!" are quite common in the US, and while we're more used to delays over here it must still be true that a lot of the initial momentum disperses by the time the DVDs roll around.
R
R