If/ when more volumes get released, I wonder if they will still focus on the years 1969-1974 or if they will expand, perhaps to 1976 or 1979, or perhaps focus on years after 1974 (1974-1979, etc). Or if they will be themed differently (like "Sesame Street in Hawia", featuring the hawiai episodes, or "Big Bird goes to Camp Echo Rock", focusing on.. oh, you know...).
I was thinking recently that it would have been great if Sesame Workshop decided to put out releases of all season premiers, starting with the first five, and then making sets for the seasons 6-10 premiers, season 11-15 premiers, and so on. Of course, the season premiers for seasons 33 and 34 have already been released on DVD (and if you count The Street We Live On as an episode as opposed to a stand-alone special, then we've got the season 35 premier on DVD as well).