Even if we cure aging the median life expectancy might not surpass 1,000 – that is a long time to not get in a car accident, fall off a cliff, be struck by lightning, etc.
The estimated statistic I've heard is that if you eliminated all causes of death related to aging and age-related degeneration, the average life expectancy would be right around 1000.
Which, more importantly, means 930 or so more years to figure out the next solution after that. See also "longevity escape velocity", for how we can incrementally get to 1000 in the first place.
