I don't know what kind of plush toys you guys are buying, but I've never seen a plush that could be mistaken for a real Muppet or even a poser. Unless you guys have some other definition of a plush toy that I'm not familiar with. High-end plush like Steiff are still plush toys. No one is going to make a Muppet plush out of Antron fleece for instance or use fuzzy sticky paper for irises that can be peeled off by a kid.
It's either a replica or it's a toy. I'm sorry, I don't see this gray area in the middle that you're looking for.
Yes, there have been some nice plush toys over the years and if you're just lamenting the dearth of Muppet product, then that I can understand. But saying that eFx should look into doing plush because the replicas are just too difficult is where I'm failing to grasp this concept.