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Demand comes at a curve, the cheaper you make it, the more demand there will be. The demand for satellites and eventually human travel is practically infinite if the cost is low enough.

If Starship cuts cost to orbit by at minimum 1/3 and at maximum 1/100th demand will skyrocket (pun intended) either way.

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The key step change for space demand is probably when launch cost decreases (in terms of $/mass) and availability increases (in terms of max freq of launches) enough so as to make private industry space resource extraction and processing profitable.

Once there's a usable supply chain at the top of the gravity well (or on bodies with lower gravity), a lot of other launch demand is unlocked, because you can do truly interesting things (colonization et al).

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