This topic had been brought up many times. There are issue with it. Not sure yo could even get the ships to spawn NPC's Also scaling up the systems would create a lot of work for the Dev team who are already buried. Scaling up would also make it take 40 minutes to get across the system.
Having played Eve..I do not want a 3 hour trip to get from one side of Sirius to the other like it takes in Eve.