What? Are you saying that the Thunderbolt display doesn't work with any Macs with a mini-Display Port connector? That doesn't sound right to me, but I may be wrong!
Isn't the Apple Thunderbolt display just using the display-port channel of the Thunderbolt connection?
I presume you mean any computers that have mini-DP, but don't support the Thunderbolt protocol (the connectors are physically identical). I don't actually know whether there are any Macs that have mini-DP but don't support Thunderbolt?
So can you actually use a Thunderbolt display with a computer (e.g. Surface Pro) that has mini-DP, but doesn't support the full Thunderbolt protocol? I wouldn't expect the Thunderbolt pass-through to work, but it should at least work as a display, no?
Edit: I've done some more research, and you are indeed correct! It does seem a bit restrictive for the Apple Thunderbolt display to only accept "full" Thunderbolt connections, and not accept standard video input via mini-DP - I guess the hint is in the name "Thunderbolt Display"
However, it's a bit disappointing that the USB-C on the rMB doesn't support the full Thunderbolt protocol. I fear that Thunderbolt may not feature strongly in Apple's future hardware lineup.