I e-mailed Disney about a week ago and this is their response. Not word by word, but a summary of what they said.
Thank you for your interest for TMS S4 & 5, we don't have it on the horizon yet, but we will see what we can do. Basically Disney doesn't care. I don't get this! It's been a decade since Disney's owned the muppets, and I remember when I got the Season 1 Box-set. I was so glad, but back then the best we had were those 3 episodes on DVD from Tine-Life and Columbia Tri-Star. Then after 2008 and we had season 2 and season 3 I couldn't be more happy. Fast forward 6 years later and I literally want to go to Disney and slap whoever's in charge in the face. I mean if they're not going to bother releasing Season 4 or 5 then why'd they start making the box-sets? Don't get me wrong those season box-sets are the pride and joy of my DVD collection, but come on Disney, just put down boxset. Oh I feel a song coming on
.
Disney, you gotta put down the box sets
Put Down the box sets (chorus)
Put down the box sets if you want to see those sales come throughout
You don't put it in a fire
You don't put it on a rocket
You don't give to Sprocket
Disney put the box sets down
Put down the box sets if you want to see those sales come through
I hope you see this Disney and you put the box sets down.