It's called a hypothetical question. People discuss them all the time, mainly for entertainment and just something interesting to talk about. Like, "What would you do if you won the lottery? If you could be any animal, which one would you be? If you had the powers of invisibility, what would you do?"
Then sometimes a grumpy party-pooper comes along and says, "None of those things will ever happen, why waste your time talking about it?"