i think it's going to come down to what's put at that time.
for example, we know Sam Arrow will be in series 4. so when will we see another MTI figure? will we get a Captain Smollet? Fozzie and Mr. Bimbo? Gonzo and Rizzo maybe? personally, i'd love to see a Clueless Morgan. the point is, if none of those have come out yet, then why bother with a playset. there's nothing to use it with but Sam, and whoever it comes with. That works for Muppet Labs, but not the bridge of the ship. you want to be able to interact with it, and you want figures that fit with it.
even Muppet Labs has some variety...you have Bunsen, and then 2 different Beakers (3 for some) that can enact various mishaps. i'd love to see a Beaker w/light up eyes and "blow off" hair, an "exploded" Beaker, and especially a "bonkable" Beaker with a head that lowers into the body. i've wanted that since i HEARD about the Muppet toys.
the point is that they're playsets...you need to have things to interact with them, or you're not playing.