I doubt we'll ever have a real Echoes product that small. Since we do an adventure and sourcebook together, they'll all be 100+, but even the adventures alone haven't fallen below 50 yet (the fifth adventure is the first candidate, and I think it will balloon up then I get beyond the notes stage). We have some supplemental character creation stuff on the drawing board that might go shorter, and if some friends of mine decide not to go forward with it, maybe a d20 critical hit product, but those aren't actual Echoes products (the character creation one is the only one that might even have the logo in passing).
Of course, things change, so thanks for the input.