"Of course the new car is going to be bigger and heavier, EVERY SINGLE CAR on market is the same.
They have to be increased due to safety regulation and what not."
Still, more small cars than ever are being produced and really large vehicles are being discontinued. Material technology have made huge strides to make lighter and stronger constructions.
Engines are dropping in displacement and there is no reason why cars should get bigger and heavier and I think we might be at the crest now. Porsche already dropped 400 lbs of the Cayenne, VW made similar reductions on the Touareg. The new Audi Q7 is rumoured to drop even more and the Range Rover still more. I think the next 5 series will be lighter than the F10 which I think will be keep it's position as the heaviest 5 series forever.