Do Film Makers Want 4k? I am looking at upgrading our camera equipment and am trying to work out, to 4k or to not 4k?

We need a relatively compact camera in size and weight for our productions specifically.

For generic video productions companies, do they want 4k?

Is 4k valuable at 8 bit, 24fps, or do they really want 60fps?

Would they prefer us shooting high quality HD (1080p) footage upto 60fps (i.e. 12 bit, 13 stops, raw)?

We are having real trouble making a choice, as picking lower end 4k seems to have some big caveats. So is it worth it?

We have had some tell us, 'YES GO 4K!' And others, 'don't bother'.

Any tips would be much appreciated, thanks.
In my opinion, the market for 4k delivery is still very small, but that doesn't mean its useless.

Shooting at a higher resolution than the delivery resolution allows you to recompose shots without any quality loss. If you shoot a talking head in 4k but deliver in 720p, you can get a wide, medium, and closeup from the same shot. 

In my experience clients nearly always want video delivered in 24/25/30fps. Higher frame rates should only be used to achieve slow mo. That being said, everyone loves slow-mo, so the ability to be able to shoot at 60fps or higher is valuable.