It’s not really sensible to compare a single spacecraft with what is essentially a fleet of ships with an order of magnitude greater cargo capacity. It’s the possibility of refueling that unlocks the ability to push really large payloads beyond LEO, and many of the more audacious plans (like a Moon base) do require a lot of cargo well beyond LEO.
This is only true because we are so completely beholden to the tyranny of the rocket equation with the current status quo. With the $/kg (and payload volume) that Starship would unlock, the entire ELO/GEO/Interplanetary/Deep Space market looks very different.
Labs in space. Hotels in space. Weapons in space. Much more interesting satellites in space. More government science missions. Privately funded science/research missions. etc
A huge synthetic telescope in orbit with an aperture the size of the planet?
How many private earth observation satellites?
The market is huge when weight constraints largely go away and $/kg drops so hard.
What does that even mean? Almost every single Falcon 9 customer will prefer launching on Starship if/when it is available, because the cost will be much lower. A very small segment who have payloads that are exactly Falcon 9 sized and want a very particular orbit might still be better served by F9, but maybe not.
Beyond that, much lower cost unlocks previously untenable opportunities that you have not sufficiently imagined, as stated earlier.
Of course it does. With Starship, SpaceX could've charged NASA/ESA more to launch a bigger JWST than the cost to launch with Ariane 5, with huge profit margins.
On top of that, with a much larger fairing, you could almost certainly simplify the telescope and increase capability. A significant part of the JWST's complexity is the unfolding sequence, which could be simplified with a fairing that is more than double (triple? quadruple?) the volume.
Well, they are going to live with multi-customer payloads if Starship can do it for a tenth of the price. There's already a large market for ride-sharing and it's only going to get bigger.
Except that at some point this stops being true. Induced demand is not infinite. There's no telling when we'll reach that point, or indeed if we've already reached it.