Let’s be honest or at least in IMHO, Mongoose miniatures lines have suffered because of a few reasons. The Babylon 5 game suffers from a general level confusion on what ships to use, what rules set is current, how many incarnation of a B5 space combat games have been around two or three, see what I mean? There are AOG B5 products still floating around out there, and that muddies up the water. The B5 RPG miniature line is inconsonant at best. The Minbari are great, the Humans and Centauri are just awful.
SST miniatures suffered from a scale bloat, they are great figures, just too big for most people. I use the skinnies and bugs for my Traveller game, but in general the scale makes them unusable, know there are ways around scale difference for the truly crazed gamer, like me.
Miniatures are an investment, and gamers, look for economy and multi use in addition to a great set of rules. Game Workshop really blew it when they did Lord of the Rings in true 25mm, that would have been great years ago, but today its 28mm that rules conventional marketplace. The only way we will see Traveller RPG miniatures, is as complement to a new “Striker” game. Which, I would play in heartbeat.