will people have robots?肯定回答可以缩写么?---yes, they'll.

不可以缩写。如果是简要回答，要写出动词的完整形式。这是书写的惯例。

Will people have robots?

肯定回答Yes, they will. 这样才规范。

当然，如果你回答的详细，可以缩写。Yes, they'll have robots.