I was thinking the other night, since Warner Bros. seems more interested in releasing two-disc collections of it's animation properties than four discs, maybe there could be two-disc Sesame Street collections, similar to the Looney Tunes Golden Collections, but each disc could have seperate 90-minute "themed" content, plus a handful of 5-10 minute themed content.
For example, volume 1, disc 1 could have 90 minutes of Bert and Ernie sketches, then approximately 90 minutes of alphabet inserts (one for each letter, and a few general alphabet segments), and maybe all of the ice follies sketches. Then disc 2 can have 90 minutes of classic Grover sketches, 5-10 minutes of season one Grover sketches (keeping them seperate), and around 90 minutes of number segments. And then for volume 2, disc 1 can have 40 minutes of Big Bird, 30-40 minutes of Oscar, and 15-20 minutes of the human cast, then disc 2 can have 90 minutes of Cookie Monster, 60 minutes of pageants and stories, and ten minutes of Sesame Street News (or live action and animation).
Heck, last night I was thinking of ideas that could be a little bit too far/ ridiculous: A two-disc ccollection higlighting the first 20 years, a two-disc collection highlighting the first 24 years (before "around-the-corner"), and a two-disc set highlighting the first 32 years (before the big format change).