From what i have seen deadfire sold better after the last expansion was sold. one way that it could have sold better was with better marketing, releasing to the consoles at the same time or close to the pc release, more detailed combat maneuvers . also, perhaps some upgrades in comparison to old rpgs but without completely losing the spirit of baldurs gate. perhaps mixing some aspects of new rpgs with old rpgs to obtain a balance between the classic rpgs and new rpgs. unfortunately that may be necessary.