The problem is legal red tape, that's what! Obviously, some music rights holders and celebrity estates still refuse to budge and grant them the licenses that they need!
I wonder if the emails and whatnot that Disney gets regarding Seasons 4 and 5 get shared with the greedy, miserly jerk legal people that won't let Disney have the legal clearances that they need in order to release Seasons 4 and 5. That would probably go a long way towards getting the remaining TMS seasons released, especially when the legal people realize that they're losing money by the sets not being released.
You know, if you put it
THAT WAY I kind of feel sorry for Disney. Who knows which guest stars or guest star estates or song writers or song writer's estates are keeping Disney from releasing the remaining seasons, I mean why would they do that anyway, why torture the muppets when the guest star on the show most likely begged and pleaded to be on it! So, why wasn't there this problem with the first three seasons then? What gives me hope that Disney'll at least attempt to release the last two seasons is this.
This video was made on July 3, 2014. Well, not the video, but the advertisement at the end which states
"IN STORES NOW" which shows the theatrically released muppet films that Disney owns besides TM'11 on Blu-Ray along with
THE FIRST THREE SEASONS OF THE MUPPET SHOW ON DVD!!!!!!!!!! It also says copyright 2014 DISNEY. So they've got to have more planned if they market the first three seasons on that video and amazon and the three seasons could give you discount $ on MMW in theaters, so I mean if they market it well then they obviously have more in store. So, I'm guessing they're planning the release of TMS s4 and s5. Maybe not tomorrow or next month or even next year, but it'll probably be coming soon.