It's a bit of a shame that ExpressCard never got traction. I've had mixed success with USB Ethernet compared to the old PC-Card Ethernet.
To be fair they did change the name of the standard to PC Card - people just kept using the old name anyways.
Express Card made the mistake of offering multiple form factors which made it harder for laptop manufacturers to support.
This may change thanks to USB 4 (and Thunderbolt) being able to directly use PCIe lanes.
It's a bit of a shame that ExpressCard never got traction. I've had mixed success with USB Ethernet compared to the old PC-Card Ethernet.