It is just plain normal language to refer to a loss as a comparison against a current trajectory or current state. It is reasonable to assume that the reader/listener knows that the future cannot be predicted exactly, because this is generally true. This is why it isn't said explicitly.
It would be silly to correct someone who said "I just accepted a $120,000/yr job" with "you don't really know for sure, you could get fired or die". The colloquial presumption is that the rate of future income cited is dependent on a steady trajectory without confounding variables.
It would be silly to correct someone who said "I just accepted a $120,000/yr job" with "you don't really know for sure, you could get fired or die". The colloquial presumption is that the rate of future income cited is dependent on a steady trajectory without confounding variables.