I have come across the following construction in which the examiner used the Future Progressive Tense. Isn't it right to use the Future Perfect Tense?
By 2150, the world's population will be increasing to 10 billion.
Grammatically it is not incorrect, but it presupposes a very special context.
The preposition by implies that something will have been completed by that time, therefore the continuous tense is kind of strange.
By 2150, the world's population will have increased to 10 billion.
In 2150, the world's population will be increasing to 10 billion.