It becomes known. Although it's still expensive, and mostly only used by professionals, a fair percentage of the public knows about it. This is where high-end computer film special effects are now. The price comes down to where average people can afford it. However, it's still too new for most people to understand or use well.
Recordable CDs are about here.
This is the point where the general public begins to understand it enough to use it well. More to the point for skeptics, this is the point where it is in widespread enough distribution that unscrupulous individuals are using it. People find it hard to imagine what life was like before it. The telephone, TV, and cars have been here for years, in the industrialized nations, at least. The technology to produce good faked videos is maybe just barely at 4.