I thought that the object in Buddhism is to eliminate desire, even the desire for enlightenment ultimately. So in the end both the Kusal and Akusal are what cause suffering and need to go. Is that right?
As far as I understand Buddha, 'kusal' should be desired. Buddha himself desired to turn the wheel of dharma instead of instant 'nirvana' which was available. It is the 'akusal' which one has to abandon. For enlightenment follow the noble-Eight-fold path. I am not a Buddhist but I consider Buddha as one of my gurus, so I may be excused if my reading is not correct.
Krishna too did not want inaction. He endorsed action to fulfill dharma. That is a 'kusal' desire, even if it entails lots of difficulties.
"Do thou fight for the sake of fighting, without considering happiness or distress, loss or gain, victory or defeat – and by so doing you shall never incur sin." BG 2.38
"You have a right to perform your prescribed duty, but you are not entitled to the fruits of action. Never consider yourself the cause of the results of your activities, and never be attached to not doing your duty." BG 2.47
"Perform your duty equipoised, O Arjuna, abandoning all attachment to success or failure. Such equanimity is called yoga." BG 2.48
So, the message from Buddha and Krishna is the same. Act, do not be inactive, do what is necessary and righteous in a particular situation, whatever may be the difficulties in performing your duty, and do not think of returns. That you have performed your duty is a reward enough.
Have you given up worldly desires?
Why the discrepancy between 1 out of 1000 and 1 out of 8 people living on earth?
There is no discrepancy. So it will be just 8 people out of the (nearly) eight billion people on earth. He was, as he said sleepy at that time. However, my view is that there are more than eight such people because the sky is not falling.