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In case someone else wonders, neither of the sentences contains an indicative mood, future tense verb. They are subjunctive mood, future tense verbs.
The future subjunctive tense is all but dead in modern Spanish. Unless you're reading/studying old literature, it's unlikely you'll encounter it.
The future subjunctive has been replaced with the present subjunctive. (Likewise, the future perfect subjunctive has been replaced with the present perfect subjunctive.)
I don't see any reason to use the subjunctive in the first sentence. It looks like a statement of fact. So, I would use estará, or the simple future va a estar.
The second sentence also seems to be a statement of fact. If you don't go out with anyone you'll be single. (Si no sale con nadie, será soltero.)
¿Me equivoco?
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