I see the motivation, but picking one proxy metric to understand your business by seems like an overreaction. Unless it's not a proxy metric, that is; if you could predict discounted future profits, then "estimated present value of net future profits" would be a great metric (assuming those are accurate estimates). But if it's really a proxy metric, all proxies are wrong in more or less interesting ways, so you might want several angles from which to view what's going on.