[Grammar] Will everyone be using smartphones by the end of this century?

I come across a sentence on page 64 in Bai Tap Tieng Anh 8 ( tap 2) by Mai Lan Huong. I don't understand why sentence 1 is correct. It is neither an action in progress at one point of time in the future nor in a normal course of events. I think it is just an action which will happen in the future, so I use sentence 2. Could you please explain?

1. Will everyone be using smartphones by the end of this century?
2. Will everyone use smartphones by the end of this century?

Son Ho said:

It is neither an action in progress at one point of time in the future ...

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Yes, it is.

You can understand this sentence as talking about a future trend. That means that the action (using smartphones) will be in progress at a future point in time (the end of the century).

The future continuous/progressive tense is used to make a projection into the future, that is if everything else happens as we expect.

jutfrank said:

Yes, it is.

You can understand this sentence as talking about a future trend. That means that the action (using smartphones) will be in progress at a future point in time (the end of the century).

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Then we can use both of them. What is meaning of sentence 2? Could I use sentence 2 in this situation?

1. Will everyone be using smartphones by the end of this century?
2. Will everyone use smartphones by the end of this century?

No. Use 1, not 2.

Could I use the simple future by adding in the future?

1. Will everyone use smartphones in the future?

Son Ho said:

Could I use the simple future by adding in the future?

1. Will everyone use smartphones in the future?

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I think that the problem with "Will everyone use smartphones by Time-X/in the future" is pragmatic; the sentence suggests that no one uses a smartphone now.

Consider that no one would say "I will use a smartphone by Time-X/in the future" if he or she presently uses a smartphone.

However, one who presently uses a smartphone could very naturally say "I will (still) be using using a smartphone by Time-X/in the future."

Son Ho said:

Will everyone use smartphones in the future?

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If your point is that this is a good replacement for "Will everybody be using smart phones by the end of the century?" then no it is not.

(Just about everybody is using them now, so I don't really see the point of the question.)

Grammatically, the problem will be the same if we substitute "Will everyone eat cabbage by 2030?" or any such sentence.

Son Ho said:

Could I use the simple future by adding in the future?

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Why try? The original works.