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The entra-link is dumb and wastes so much space. Multiplayer features are, when looking back, the cause of a lot of each gen's downsides but Unova has the burden of it being baked into the actual Region Map.
This is my take without any of the BW lore, just looking at how to make this map not so boring to explore. Remove Entralink and all bridges, then start in the standard BW1 town, move north to Version City/Forest, take an air plane to the airport, then move south to the BW2 areas, and ferry to Castelia. From there, its straight north, with one detour needed in the swamp tower place for your dragon mcguffin. Then its straight to the E4, with the Kyurem cave still getting to be post game but also Resort areas works as a perfect finish line!