Not in datacenters it wouldnt.
Generally you'll just have your servers racked up with power and ethernet - you dont need anything else.
In MOST cases you'll never hook monitors up to a server, and if you do it'll be from a crummy onboard gfx card (most likely VGA as well) for terminal use only.
Really all the thunderbolt port is doing is changing your options from plugging a ~$50 VGA monitor along with a $2 keyboard directly into the server (so 2 ports) to just 1 thunderbolt, going into an expensive hub.
Really not worth it.
Heck some places I've seen dont even have onboard graphics, and instead just have drivers for USB graphics cards that get plugged in when someone cant access the server via remote console.
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I assume you may have been talking about the Mac Pro server market, in which case it's still going to be the same situation (in 90% of cases, you never, ever should work directly on the server).
The only time I can see it being useful is for read/write to disks, but even then, there's a very tiny usage market for writing at 10gbps that needs to be done 30 meters away from the server.