jacksmacks comments

As knackerz mention, night buses are the way to go. Doesn't make sense to have the trains/subways run all night. Night buses would be packed and pay for themselves. More people would stay out late, which would boost nighttime businesses. Taxis would still have a similar amount of customers, because those who can afford to take a taxi would. These are mostly the same people who take them now.

If a country is not ok to do this, then external labor should be limited to short stay periods to avoid having large settled populations at risk of heavy loss in downturns.

Everyone makes their own choices. Working a temporary position in a factory for 20 years is a choice. Many workers in this position in Japan have acquired land in their home country, built houses and educated relatives. Getting laid off in bad times is a risk of this type of work. But the rewards are great. There is no reason to guarantee workers jobs in a capitalistic society.