Possible and Viable are two different dimensions.

An impossible thing is automatically non-viable.

A viable thing is automatically possible.

But there's a large class of things that are possible and also non-viable.

Friction makes a very large class of possible things non-viable today.

If you reduce friction, that class gets smaller, and many things pop into being viable.

This process is hidden and indirect, since intuitively we lump possible and viable together.