Why not build on top of everything we have? Instead of repeating the whole thing?
Now in the mainstream games industry the goal (for the most part) is to achieve photo-realism.
The goal of the mainstream industry is to make money!
(I guess money is their god, so in a sense you're right: they are the same

)
I don't think mainstream games are trying to achieve photo-realism anymore. If anything, they are trying to get closer to cinema-realism. And I do wish they'd already invent that 3D camera! Maybe then they can hire some actors for a change.
In the last years, however, AAA games have been moving away from straight-up realism. They have started to play a lot more with special effects, with stylized forms. Granted, often this is cheesy or only chosen for gameplay reasons. I think a lot of developers are starting to see that games that try to look realistic, simply end up looking kitschy and they are looking for a "style" instead.
And, indeed, old art styles like impressionism or surrealism, etc, can inspire. Much like they themselves were inspired by older art styles. But we should choose our sources according to what we are trying to accomplish in terms of content, and then build from there.