That also means that a) it's harder for younger people to get a stable job b) the bare minimum of work not to get fired decreases over time, which is bad for productivity.
If a significant share of your employees optimise in the sense of doing the least of work possible, without getting fired, you have a huge problem anyways. Usually, given the right conditions, people have intrinsic interest in doing a good job. Even if their motivation is more of the extrinsic type, there is more to it than getting paid.
Yes, it only works in a high trust society where there’s plenty of jobs and people actually care about doing a good job (any company will have incentives, people can’t just sit around and do nothing, lots of social pressure too if you’re a slacker). But hey, that’s been mostly true (until recently, I hear immigrant unemployment is really high, while “local” unemployment is close to zero, but the official statistics sit in the middle at around 7% I think, much higher for the youth).
In my experience those people get juicy positions doing nothing useful as they their competence long atrophied due to zero pressure to keep their knowledge up to date. Of course now companies hire "consultants" to work around to issue, so those get fired on a week's notice when money is tight. The warm bodies remain in their chairs until retirement. Inefficiency remains a huge problem in Swedish economy, but no one dares to touch these archaic rules (BTW no minimal wage in a European country, WTF?) due to political reasons, so the immigrants get the blame instead for everything.