I'm not sure why you're calling me unpleasant for pointing out that it's short-sighted to imagine transitional protection means no one has to worry.
You've just listed some very common things that will cause transitional protection to disappear: for example, moving house. People in rented accommodation may be moving house more than once a year - not through choice. It's also very, very common to have to move when circumstances change for the worse - which also tends to coincide with the periods of one's life when one needs more support (illness, leaving a relationship, losing job, etc).
Transitional protection is a PR device to stop sad face headlines of eg poor people who got X amount last week and Y amount less this week.