Lol With an independent government,the Kazakhstan can't be assimilated.Even the Chinese Kazakhs still keep their culture well,and they don't have "ov""ev" in their lastnames,so they keep more traditional Kazakh culture,also the eagle hunter still common in Altay region of China.Also as I point out,with the Chinese population declining,your so-called 20-30 million resettlement can not became true,there are many Chinese merchants in African and other parts,but thta's all,merchants can't be a majority in a country.
Kazakhstan has a free choice,they can have good relation to US,China,Iran,Turkey and Russia,if those relations can serve their interests,then others should be fine.