I think the lineup itself is fine, what makes it appear stale is that some ships become entirely obsolete once you have access (i.e. money and/or rank) to another ship that just outclasses your previous ship in any way. Before the 1.0 release, I had high hopes that ED would avoid the linear progression trap and what I call "Freelancer Syndrome", named after the game Freelancer which also had a large variety of ships but in the end there were also kind of the "big 3" that outclassed everything else, so after a while almost everyone flew only these.