I could definitely see Traveller splitting up into Referee Guide with design tables and Players Guide with the game rules, both setting-free. Then separate settings books. The present arrangement is very messy - rules and tables all over the core book, with ancillary tables and ancillary rules apread all over the other books. We used to have all this with Megatraveller ... dont know why we didnt stick with that format.
And Third Imperium setting stuff spread all over the place. The original CT game was completely setting-free originally.
D&D is much better organised than Traveller. Maybe this is how the Traveller 5E will be. We will no doubt find out very soon.