Although there were basic market dynamics in Frontier and First Encounters, I always felt it was too straightforward to fly between Sol and Barnard's Star selling robots without any risk.
Market forces in an Elite-themed MMO environment would make it such an enjoyable experience. One can imagination hunting around star systems affected by war, supplying them medicine (or even black market weapons!), having to compete with other players to get the best deal.
Do I upgrade my trade capacity to make more of a profit or do I install a laser bank to reduce the risk of making any? What will the other guy(s) do? Can I hire somebody to protect me who will take a share of the profit?
Infinitely more fun than the 'grind...grind...grind...' dynamic that plagues MMOs these days.