The problem has been low wage migrants are a constant cumulative net cost (financially speaking) and I think even some average wage migrants will become a cumulative net cost if they remain here into old age. This is the same as a lot of lower paid Uk born…they’re a cumulative net cost to the state. An additional problem is if we’re replacing UK workers with foreign born and U.K. born then just go onto welfare we’re creating an even bigger mess
Said it before, we’re running the country like a giant scheme ponzu scheme with short term thinking, no longer term vision and just kicking the can. Increasing a population, who ultimately will get old themselves yet productivity and GDP per capita decreasing

.
To answer the question, we should’ve been encouraging child birth rates with better assistance around child care etc (it’s finally improving) and also accept that we will need net positive migration for both jobs/skills and financial contribution but this has to be controlled/managed properly….just having net ‘000s per annum is impossible to absorb without proper planning
Ps Before any meltdowns off anyone I’m fully aware that people (UK and foreign born) offer more than just a financial input to the state/country. I’m just explaining purely on financial terms