Rear exits are already the same size as the front exits, but getting a jet bridge safely past the wing isn't easy so you'd have to mirror what European carriers

Rear exits are already the same size as the front exits, but getting a jet bridge safely past the wing isn't easy so you'd have to mirror what European carriers do and use dual stairs. If you're thinking of using two front exits, jet bridges also can't get too close to the engine so the only narrowbody that works for is the aging 757. Plus it doesn't really save time because the space between 1L and 2L is generally first class.