Why would the Uighurs leave China tho? Ask yourself this question first. They have huge market and access to all chinese cities and I don't see why they would want their own country when they already have one that is better.. And these who want to leave they do leave elsewhere of their chosing.. But But I see this as veiled Chinese attempt of expansion that is all I see
Does China want piece of Kazakhstan? citing the population gives you off and you do know the uighurs are to tiny minority who can't even fill out Hong Kong or even smallest city of china but millions of chinese will accompany them into this fancy land called Kara khan
Should Indonesian chinese or other chinese minority in Vietnam or elsewhere also have their own country in order to be happy that is none-sense.. The Uighur are a very tiny insignificiant minority that has got to much media attention and majority of them are happy living in the Sub-urbans of Shanghai rather then to be in the steppes. I have seen these who wanna leave have been leaving since the 60-70s to even today but majority of them want to rather move to inside mainland china and to the urban big cities