There will always be ways to lower the marginal cost of a product. Even if this cost is measured in atoms, people will be looking for ways to reduce that cost.

There will also be art for a very long time. When everyone has a practically infinite supply of goods at their disposal, they will still want to create things for status, and this will be instantly transferable around the world. The internet increased the supply of art even as it reduced the marginal cost while leaving fixed costs mostly untouched.

There will be limits to transportation. Right now, that theoretical limit is the speed of light. People may compete for the right to travel to a far off world or to reach new worlds faster.