I would love to see a double-height card.
Seriously. Maybe it needs to be taken off to throw the laptop in a bag (but that’s easy, right?), but having “legs” would be good for ventilation, and I expect the extra physical space would be hugely useful. RJ45 jack with no folding, maybe dual ports, and you could even do clever things like have a port sticking out front/back (relative to the laptop) rather than the side.