The problem is that education in Germany is so inefficient that most talents of most people are just wasted.
People who can't get a proper education because schools and universities are not sufficiently funded will no be able to support the old.
If Germany doesn't start to spend a lot more money for education than it does now, than more young people will jsut cost the state more money.
There is a LOT of free education now available on the internet, well enough that anyone with the least motivation can self-educate.
Stanford, MIT, Berkeley all have courses available for download on iTunes, for example.
This is why the One Laptop Per Child initiative is expected to pay dividends, because the kids need only be taught how to teach themselves, and so we'll rapidly boost their education levels