CPEC will lead to a surge in revenue, period; thus leading to an increase of our defense budget.
We did not initiate one of the world's largest and most ambitious mega-project to become bankrupt. I would rather take the word of the hundreds of engineers, geographers, planners, economists, financial institutions, world organizations and etc... that have green-lighted and praised the project over your little guess.
Have you ever thought for a second that what comes out of India regarding Pakistan is mostly BS, including the CPEC related rhetoric? India has been spewing falsities since 1947 - spinning up the most absurd theories and conclusions I've ever heard in my life. To give you an example, not too long ago; the most viewed Indian news agencies were claiming that Shahid Afridi is an ISI agent because he took pictures with the DG ISPR. Indians being a gullible, over-egoistic and low-IQ people would obviously believe that.
The perception that Pakistan will become bankrupt, collapsed, implode and blah blah is nothing new amongst Indians. They are fooled into thinking that India is some super-power and Pakistan is a crippled and dying desert country when in reality an average Pakistani is better off than an average Indians. Keep believing what you want to believe, in the end - it's not going to change the reality.