It's not likely to get a full-length feature film as a bonus on a set of shorts. However, since the last set of these (the Curly-Joe years) would obviously be a set of features, why not all of the features. If they can release a set of all the Three Stooges features made at Columbia, why not a set like this:
The Three Stooges Collection: The Feature Films
The Captain Hates The Sea
Start Cheering
Time Out For Rhythm
My Sister Eileen
Rockin' In The Rockies
Have Rocket, Will Travel
Stop! Look! And Laugh! (aw c'mon, you know they'll include it)
The Three Stooges Meet Hercules
The Three Stooges In Orbit
The Three Stooges Go Around The World In A Daze
The Outlaws Is Coming
Now, that would be a set worth getting. And having the original Curly Howard on there will help sales figures for sure.