Network administrators (at least myself) have been dealing with this for 25 years. Joe User moves his machine (desktop or server) and guess what...it stops working. I automated mac authorization on AT&T StarLAN10 hubs in the mid 90's so I could allow Joe User to move his machines and still maintain security and be able to know when machines were moved or replaced.
With clone-and-go under VMware (or elsewise), the network administrator has to give up control (which we don't want to do) of the network to MCSE (or worse) trained system administrators, and while they may be top-notch at systems, I have met very few who knew anything about actual networking. (ymmv)
All I can say is that the communication between systems admins and network admins has to get better, and it /is/ a two-way street.
Also, shouldn't this be an extension of the 10gig spec re: interface partitioning?