OK, 9x the value of your property as liquid wealth is nice, but you'll still need to pay it back eventually, won't you?

After you've paid it back, you still own the property which is 9x the value, or maybe more. So you can cash out instantly, without having to move out. And you get to pay it back in 30 or 50 years time. By that time, the money is worth half or less than half than what it is today. And your interest is much less than inflation. And you can deduct the interest from your taxes.