"The inventors will invent, for that is what inventors do. The technology will come first, the products second, and then the needs will slowly appear, as new applications become luxuries, then 'needs,' and finally, essential. " - Don Norman

That is the epitome of what a good engineer should not do.
Needs are not dependent on the existence of a service. Needs (including latent ones) exist and services address them.
The fact that the modality of addressing a need is new does not mean that the need is new.
When people invented the first fast food they already had the need to eat. When Facebook was invented people already had the *need* to interact socially (or if you were Zuckenberg check out chicks on campus, yes, that's pretty much how it happened).