I would miss a built in ethernet port. (My Thinkpad X230 FTW)
Anyways, your examples are not exactly the same as this situation. In the cases of removing the floppy drive and CD/DVD drives, it was upgrading one technology for another which was able to hold more data, was a more stable medium than the predecessor, and was generally more reliable. The 3.5mm->bluetooth was not an upgrade in stability or reliability, and the ethernet->wifi change was not an upgrade in anything except 'mobility' (but systems with ethernet jacks at that time typically had wifi too, so, again, it was a general downgrade in functionality).
Anyways, your examples are not exactly the same as this situation. In the cases of removing the floppy drive and CD/DVD drives, it was upgrading one technology for another which was able to hold more data, was a more stable medium than the predecessor, and was generally more reliable. The 3.5mm->bluetooth was not an upgrade in stability or reliability, and the ethernet->wifi change was not an upgrade in anything except 'mobility' (but systems with ethernet jacks at that time typically had wifi too, so, again, it was a general downgrade in functionality).