I don’t mean the actual interest rate is negative. I mean that if you intend to pull $50k/yr from it inflation adjusted, you won’t be able to keep up with a 5% return. You would need 8% returns per year to keep up with a $50k/yr drawdown, assuming a 3% inflation rate.

The other option is you pull a fixed 50k/yr, but then your purchasing power decreases dramatically over time. In 10 years at 3% inflation per year you would need 67k/yr to have the same purchasing power as today.