Nobody is switching jobs because if you move you likely have to switch two jobs rather than just one.
Improving mobility means that you have to make a single earner household a viable pathway again. That means bring house prices down and subsidizing childcare.
Which would cost a bunch of billionaires a couple of pennies. So it will never happen.
The problem with building more homes and bringing down the cost of housing isn't a couple billionaires as much as a massive geriatric class of NIMBY homeowners.
I'm surprised you were downvoted because it is a huge difference with previous generation. Its also a reason people move to big cities because its easy to get a variety of jobs for each partner.
Improving mobility means that you have to make a single earner household a viable pathway again. That means bring house prices down and subsidizing childcare.
Which would cost a bunch of billionaires a couple of pennies. So it will never happen.