Simple. If a passenger is quite certain of what train they're catching, they go to a ticket office and get a reservation for that train.
Alternatively, if they have a change of plan, they use the Ten Minute Reservation system.
This is why the Ten Minute Reservation system has been enforced, so that passengers are almost guaranteed a seat.
Forgive me for sounding a little blunt, but I absolutely point blank refuse to accept that people have to move all the time because they cannot be bothered to use the TMR service. If they're too lazy to use it, then tough quite frankly, they can stand.
I put it harshly, but it's true I'm sorry.