Will the Chinese let Pakistan collapse after all this investment?
No. One very interesting thing a learned Chinese member
@Cybernetics used to often state. That there are great powers, satellites or pariah's like Iran or North Korea. In the modern global order you can't really progress without 'adopting' yourself to great powers foremost of which is USA today. Japan, South Korea, Taiwan, Singapore, Turkey, most of Western Europe leveraged their relationship with USA as a adoptee. Pakistan never quite managed to get itself 'adopted' by USA. The nearest it came was in 1960s but since then Pakistan has occupied that space between adopted and pariah.
By adopted I mean a realtionship which is structural and strategic. Economics is only one aspect. Not all transactions are looked through prism of profit/loss account. You can look at Greece, South Korea as examples. Both have been supported by the western order with money and blood. Greece has been bailed out with figures in excess of $100 billion. Considering Greece is ten times smaller then Pakistan this is like Pakistan recieving a trillion dollar bailout. US and west would defend Greece and South Korea with lives of their own young servicemen/women. This relationship goes beyond traditional profit/loss account relationships.
Pakistan has failed to nurture such relationship. It now has a chance to do that with China and CPEC is layer in that. It has to be consolidated. The Chinese know this. Those who decry CPEC investments need to be asked where were they when the country cried out for investment? Issuing travel warnings and talking of the imminent collapse of Pakistan.
As mentioned earlier CPEC investment makes Pakistan a adopted client state of China like Greece, South Korea, Polan are of USA. China now can;t afford to Pakistan failing anymore then USA can with Greece or South Korea failing. As more Chinese investmehts pour in Pakistan inevitably gets tied into the Chinese order and Beijing will NOT let it fail. You hardly expect them to run away with motorways, power stations, bridsges from Pakistan. All that investment makes Pakistan a client state that will not be allowed to fail.
The same dynamic that applies between Poland, South Korea, Greece, Italy and USA will apply to China/Pakistan. This is smething to look forward to. And not be afraid. Pakistan has tied it's future to a future and emerging hyper-power.
This needs celebrating !