No, all assets are valued on future cash flows. The fact that some assets have future cash flows that are extremely difficult to predict does not mean they aren't be valued on someones crazy estimate of them.
A company with negative growth rates still has a value (not sure what negative interest means in this context). An example is liquidations, which can be very profitable investments.
"A stock's present value is also based on it's likely future value, which is in turn based on market forces and geopolitic". The more I read your post the more I think you confuse price and value.
Lets say I find a stock trading at 5x earnings, with a good moat, and earnings growing at only 5% a year, so it obviously looks like a bargain.
But lets also assume I have a magic ball that can tell me a stocks future, and it says this company will never trade for anything but 5x earnings. I'm still buying it, not only am I getting a 20% a year return on my investment (as my imputed share of profits), but that return is going to grow over time. At some point they will either buy back stock, increasing my share of their profits, or pay me my profits in dividends.
In the meantime I can let the value grow, even in this "slow growth" business.