In reality, you choose the speed of the conveyor belt. You choose what expenses you take on and therefore how much you need to make each month. To a large part, you can slow the belt down if you like. Options like boarding houses would allow people to slow it down even more precisely if they wanted without falling off entirely.

> To stay in one place one must do the right things at all times and also be lucky enough that no bad things happen to you.

"do the right things" is really not that hard. It mostly involves not doing things like getting arrested, getting addicted to drugs, or otherwise making bad choices. It's not some crazy delicate balancing act that you're making it out to be.