Well i don't know about the development time thing. Npcs can now fly your ship while you're in a fighter. Npcs also navigate in supercruise right now. Having your ship fly with a navigation computer probably isnt too different than letting an npc take control, hell I'd almost think it'd be simpker. The nav computer wouldn't have any lines of code for evasive maneuvers or anything.
I can agree that I'd rather them fix other things first, but i dont see this as a huge development undertaking. Simpler than adding crappy looking gysers to planet surfaces even.
NPC's flying your ships seems more like an adaptation of the AI, than a route following, star avoiding, pressing [J] tool. We needed the AI for the game, now it does more. SC is not what your computer would operate in.
So, does that mean that the discussion shifts from 'We should have a Computer' to, 'When should we get a Computer'?