Skyrim is rather small (so are Oblivion and Morrowind) but! what if we were to increase Skyrim's size to fit the size of Daggerfall?
pros: Taller mountains, longer roads, larger Holds, dense forests, Lore accurate Skyrim and a map the size of Texas or maybe Canada... (I'm not a Geologist (if that's what they're called ))
cons: lost of wasteland with empty space, Level designers and Nav meshers will be begging for mercy.