If Henson were really genorouse...
I could see The Main Six Fraggles show up in the Muppet Line, now that Palisades is using a little logo on the side of the package they could very easily just put the Fraggle Rock logo on there.
I mean of all the Henson related stuff out their the Fraggles are the one's I consider to be most MUPPETS, I know we'd never be able to get Sesame Street characters to appear in the Muppet Line, for obviouse reasons but Fraggles i could see.
Although it would be maybe a bit misleading for the normal customer I don't see a problem with it. Disney did title their FR video series as Fraggle Rock With The Muppets.
And i believe the Fraggle might have to some people the same kind of appeal as those annoying Furby's, especially if the hair on their tail and head were made of string, Die Hard fans (us) would love them and average people might find them cute and buy them etc...