For the record...we don't plan on hitting bottom again.
Most of our investments are in real estate and while we're traveling/sailing they are gaining in value and being paid off by others.
No one, ever, that I know of, planned on hitting bottom. But life happens. People get sick, have an accident, or get cancer. The boat or RV is totaled. The rental property catches fire. Tenants leave.
At 35, you could have 65 years of life remaining, and in addition to enjoying freedom and a minimalist lifestyle, a lot of things can, and will go wrong. $500K just doesn't have much contingency in it to allow for you to recover without going back to w$rk (if that's even possible when the SHTF, especially if you are injured or very ill). As a geologist, I like to look at cycles, and plan for the future.
Do I enjoy the sameness of work life? Not so much (but my job has allowed me to travel to Guam, dive in Palau, dive in Japan, visit South Korea, and dive all of the main Hawaiian Islands. For me, the trade-off is a better quality of life (better food, better living conditions, better security), in exchange for basically, the last 20 years of my life (during which I traveled to the Maldives, Wakatobi, Australia, New Zealand, California, Washington, D.C., Florida, Illinois, Missouri, Texas, Bahamas (Nassau and Tiger "beach"), Cayman Island (Little and Grand), Bonaire, Hawaii Island, Maui, Wake Island, Japan, Okinawa....). To each his or her own. Like others have intimated, this isn't really a forum of LEAN FIRE folks, but all are welcome here...you might just get some negative (constructive) feedback, if folks don't think you have 100% chance of success using FIRECALC or something similar!