All you can do is assume that the market will follow the trends of the last 130+ years.
Of course, if we are in a deflation spiral, all bets are off. You can look to Japan's market at that point. I think we have deflation on the horizon, not inflation.
FIRE no later than 7/5/2016
at 56 (done), securing '16 401K match (done), getting '15 401K match (done), LTI Bonus (done), Perf bonus (done), maxing out 401K (done), picking up 1,000 hours to get another year of pension (done), July 1st benefits (vacation day, healthcare) (done), July 4th holiday. 0 days left. (done) OFFICIALLY RETIRED 7/5/2016!!