Honestly if Apple pulled that trick and eliminated 3rd party monitors they would screw themselves to no end. Trust me many working photographers and video folks are NOT using Apple monitors. We are using NEC, Eizo and several others that are far better. I use a NEC 30 wide gamut.
End of day we will be just plugging our monitors into the back of a external Tbolt drive at the end of the chain. The External will be one wire to laptop.
Huh?
What trick?
TB is backwards compatible with MiniDisplayPort.
Just because they add a TB port or 2 to the monitor doesn't mean it won't still work when simply plugged in via MiniDisplayPort....which is what it is right now.
I'm not sure I'm seeing what you're worried about?