Isn't index funds risky for living off year-to-year returns given they have up to 50% drops occasionally? Especially if you assume up to 15% return which sounds

Isn't index funds risky for living off year-to-year returns given they have up to 50% drops occasionally? Especially if you assume up to 15% return which sounds super optimistic too me. E.g. You would have made 0% return off the S&P500 between March 2000 and March 2013. That's 13 years! That would burn through 5,2 million off your capital at your expense rate of 400k