You know that isn't actually going to happen? They said this in 2010, it was posted on this forum. It's 2014 now and FDI inflows to Pakistan recently hit a low.
The reality:
July-August 2014: OICCI expresses dismay over $87 million poor FDI inflow | Business Recorder
I don't think you understand how the Chinese invest in Pakistan. It doesn't involve the Chinese putting $50 billion in Pakistani banks and hoping for the best.
Last year President Xi Jinping visited Pakistan during election time. When it was obvious/confirmed that Prime Minister Nawaz Sharif was going to be the new leader, they proposed that all competition to Chinese work in Pakistan be removed and in return China will build and operate all projects in Pakistan on their terms... Pakistan agreed and work is progressing very well all over the country.
Why else do you think Pakistan's stock market is breaking new records almost every week since December 2012?