Eve - and therein lies the rub - the ability to adapt and respond is often outside people's control, even when the spirit is willing.
There is a debate to be had about the wisdom of encouraging people to relocate regularly in order to maximise earning potential, which is known to have an effect on family breakdown, decrease social cohesion, reduce social mobility (ironically) and increase crime within communities. But quite aside from that, consider the following:
What about the person who wants to move to get better job opportunities but in doing so will lose their access to childcare and so the job is unaffordable even though they know it would pay for itself long term?
What about the person who wants to move but who is trapped in negative equity and simply doesn't have the savings to make renting out their house viable?
What about the person who has an elderly relative depending on them so can't leave the area?
What about the person who recognises that their skill set needs updating but doesn't have an employer who is willing to pay for training and cannot afford to do it themselves?
What about the person who wants to retrain but cannot because the course clashes with their job?
Some things are possible, others are not. Most are a lot more achievable if you have some savings behind you - something which the majority of the population do not have in these increasingly difficult times. In the past, it was possible to take out loans as an investment in your future, but that is also increasingly difficult.