The problem is that emigrating requires money and mobility, and Germany is looking for qualified people. Hence many of the emigrants have university degrees, and only the lesser qualified remain, which is not exactly helping much, economically.
But there is a problem. Many of the young people unemployed come from the construction. People who stopped studying when they finished the ESO (secondary education, from 12 to 16 years old) or even before that, and consequently they don't have any specific formation (and very few know german language). In this situation, they can't migrate to another country, there is no job for them here neither in Germany.
Of course, this is causing a problem on the long term. High-qualified people is migrating. Low-qualified people is staying. Spain can't keep a sustainable economy with this situation. This crisis would not had affected Spain so much if the Real Estate boom had been stopped early and the inversions in education had been increased significantly, and with this panorama the country won't be able to correct the situation, and we will be vulnerable to another crisis like this one.
Besides, it's not like Germany is paradise either. The official unemployment numbers are low compared to other Eurozone countries, but (a) that hides a lot of underemployment such as in part-time jobs and (b) even those "low" numbers are still pretty high.
Right now, and for the first time since Franco times, Spain will be a net emigrant country (2011 stats to be released soon). Germany is a popular destination. UK as well.
N.B. I live in Spain.
What about family, friends, hobbies, etc. There's plenty of people not willing to move to a different town/city/village in their own country for a job, yet alone to a different country.
That said, another out of work neighbor started a small business and my wife and I built him a small website and bootstrapped it a bit with an adwords 75 euro card. I wish more folks were like him...
We actually were looking for IT people in Malaga, but it seems that people don't really want to work. I know enough companies from 'the north' looking for people in the south; people are just not applying and if they do they mostly ask for weird conditions... I know dev jobs for at least 100 people at different companies which cannot be filled in Malaga.
Besides, the people being offered jobs abroad are capable of getting a job in Spain.
Usually, people forget about the natural unemployment rate of Spain, which has always been really high. That includes underground economy.
So, yes, there's an alarming problem with unemployment, but numbers shown are imprecise.