I think it is a good choice from TLG to make the Arocs in scale of 42030 for playing perfectly together an this was planed early.
In my opinion, in 2016 we will see a remake of 8043 as RC flagship (maybe with the new pneumatics), but as a wheeled excevator with tumbler tires.
This makes sense, because it opens the opportunity to play with 3 related flagships together in one scenario.
btw, the Arocs is the first flagship in white since 1996...