lazy asses - that's a biggest problem. There is no shortage of employment, there is no over-technology, it's just erosion of desire to work.
That's probably nature of human been, it comes and goes.
Make a thought experiment - think of model of one man on the planet - exaggerating example - if you drive Chevy-Aveo, eats junk food and live in vinil-walls home, you don't need to work too much , same with countries - everything gets cheaper, consuming less resources, less labor, less time, we want evrything now, doesn't matter it's junk and bad quality, so we get more free time, 'dollarama world'.
And that becomes vicious cycle, because you get used to junk and you get used to more free time, you don't care about vinil walls in you house, even paying huge heating or a/c bills, you're fine with junk car, which eats the rest of your resources and time on repairs and endangers you because it's junk - you don't care, you got insurance, and you don't care(or don't know) that insurance people got used to same habits, so they sold you same insurance junk, etc., etc... And once you realize you don't work enough to cover even the junk you get used to, you look to borrow - 'cause you get used to free time and junk around, and if your parents left assets, you can borrow, and still have a lot of free time, and enough junk supply.
Until eventually you run out of other people money (c)... Than what? If we continue this one-man analogy, so, suddenly , nobody lends you more money, no more junk supply and you get a maximum of free time - it comes to two choices - move your ass and get a job or try to rob others, who still works

.
But, back to the beginning above, if you want high quality home, good car and normal food, you have to work more, much more, so, your life consists of less leisure time(less unemployment), but you feel good and sustainable, and you lend instead of borrowing

. Than no unemployment, because difference - between junk and normal - in labor, needed education and resources is huge, and you need to work really hard to get it.
The problem is that when you just one man, you can make your own choices, but if you live in country of lazy asses , and that country makes a choice for you, the change is much harder to make..
Actually, no way to tell it better - amount of work vs what you finally get :
http://en.wikipedia.org/wiki/Three_Little_Pigs