I think Traveller can be a hard sell for folks who dont like random chargen (which seems most folks these days). Its also hard for backstory first style players. I sell it on the idea it flips all that on its head. You start by thinking about the skills you want your character to be able to do, and then aim your stats and careers at getting them. Being in the Navy for 1 term and then going to the merchant marines is not multiclassing! You are building a skill package and it pays to think about that ahead of time. Also, the events are where you get ideas for the backstory. Again, random elements might be hard to swallow for some, but it can really help creativity in making a character. Also, I highly recommend the entire group doing this together in a session zero as opposed to rolling apart. This can connect the group and help aid in direction.