IMHO where there are actual shortages it is because young people choose to study another domain in university or choose other jobs after university. Even those

IMHO where there are actual shortages it is because young people choose to study another domain in university or choose other jobs after university. Even those who choose software dev. tend to see that as a first step only. It may depend on the country but in Western Europe I think it is because it is hard and if you're smart enough to go after hard subjects then there are better-paid, more prestigious options.