[diffeomorphism]

Concerning 2) magnetic usb-c connectors are nice and wireless is an option, e.g. see the Lenovo wigig dock for an implementation.

Concerning 3) I think things are moving in the other direction. With immutable base OS and data seamlessy backed up (encrypted, of course) switching to a new device should be fairly frustration free.

For 4) I think we will see more and more of a mixture. For instance better integration of cloud storage, things like game streaming, more video streaming etc. . So not thin client, but not fully featured offline either.