Its just a proposal by a Chinese lawmaker. In that same article itself, there is argument against the dropping the English subject. It even looks to be unlikely to happen.
Personally, I think it is a bad idea to drop the English language. Learning English is what makes the Chinese people more aware of what is going on in the world. It is still an important language globally, despite the rising interest in Mandarin Chinese. In fact the Chinese should strive to improve the mastery of the English language. Not every Chinese will be proficient, but that is not the objective. The objective is the ability to access foreign knowledge.
Besides, from a military-intelligence standpoint, the Chinese can understand the Americans, the West, and Indians far better than the other way round. The PLA will have many more soldiers who could understand the enemy's language than the other way round. That is a powerful advantage. A PLA soldier with a basic understanding of English could pick up some words from enemy communications, or understand the enemy's written words. On the other side, the average US Marine, or Jawan cannot understand what the Chinese are communicating to each other. Even fewer would be able to read Chinese characters. They would need language specialists for the job, making the deciphering process slower. The same works even better in the information war, espionage war.
I'm surprised they haven't mentioned 2 other key advantages of having second language proficiency.
1. Improved Executive Function. If you have 2 languages, you can have 2 competing ways of thinking. The studies show this helps with decision making based on pros/cons or weighing up different courses of action
2. Delayed onset of Alzheimers in old age. 2 thought pathways means the brain is more resilient to localised degradation.