I think they will go where the market leads them. Myself I would prefer a LAN based option for playing with a few friends that also includes AI traffic. Then add a WAN based option for joining larger convoys or VTC's etc. At some point you need to add some AI traffic or create new roles for players to drive other vehicles such as the police cruiser maybe an ambulance to haul away the injured from accidents, a fire truck, tow truck, taxi, bus, limousine etc. I think if nothing else ETS2MP as it has existed over the last year has proven that throwing anybody and everybody onto one server is just too problematic for a driving simulator that requires more skill than just pointing and shooting.
I have to admit though even with all of the chaos it's been an interesting year!