Many Full timers who have "backup plans" for exiting out the lifestyle assume that they can buy/rent a home/apt when they need to exit the full timing lifestyle either by choice or by being forced due to ill health. They do not take the appreciation of real estate (and thus higher rents) in to account. Thus any "back up" plan is really just a plan that makes them feel better about their choice to go full timing. When you full time you have usually have two depreciating assets. They will not provide you with any significant dollars when your forced out of full timing if you have owned them for any number of years because they will have DEPRECIATED.
Yep, full timing is not for everyone.