The fact that we find it odd when we think about it is testimony to that. Perhaps the sense of wish or desire is not entirely clear any more to most modern speakers, but it is the reason behind this construction. What this really and originally means is "he doesn't want to come out", the old meaning of the verb. The type of sentence you quoted is a good example: So the verb will changed from wanting to future probability, but not quite: in certain uses, it still (partially) has this old meaning of desirability. See this question, whose answers contain a more thorough explanation of the shift. It is common for probability and desirability to be somewhat fluid and shift around in all European languages I know.
Then at some point its meaning began to partially shift from desirability to probability: he will do it means "it is highly probable for him to do it in the future" rather than "he wants to do it now". In discourse analysis, we study how people interact by expressing meaning using language within a context. Simply put, discourse analysis is the study of language in use. Originally, the verb had a meaning similar to want/wish, as it still does in Dutch: the verb willen means "to want". An utterance, then, is the real-life expression of peoples thoughts, ideas, and feelings. The English verb will is related to the noun will, which is one's capacity to want or wish to do something.
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