The sentence is my answer to the question of whether robots will replace teachers in the future. I am not a linguist or a native speaker, therefore I cannot tell the truth. Personally, I speculate that the sentence can exist only if 'it does not' denotes 'it is impossible'. However, I should have answered the question this way:
It's tough to envisage the future without teachers; despite AI benefits over a person, computers cannot replace teachers. Neither can robots.
As you can see, envisage can be used without the second verb. Instead, a noun can stand after 'envisage'. Also, I could have used a modal verb instead of 'it does not'. Today I was passing the oral part of the state English exam. In result, I have scored 19 out of 20. No one has taken the sentence into consideration. One point was missed due to mispronunciation. Nevertheless, I wonder if I can say 'I envisage it does not', and a native speaker will understand me; if it sounds natural, and if it is correct.