China will continue to stand with Pakistan in its defense against India and other adversaries, because that is essentially is a part of china’s own national security and an economic feasible way to check mate the Indians.
1- The negative ROI is no longer worth a Pakistan which maintains institutional dependence on the west and hence cannot be relied on.
2- Inability to deliver Policy reforms for CPEC ( software to run the hardware)
3-Deterioration of security environment and inability to manage