Is it really worth it to relocate to another country with a family of four just for Wanderlust -- whatever that means.
Especially if you are taking a hefty pay cut -- if I know San Francisco's salary levels well, not to mention kids at an important stage of their education. Especially if the education is conducted in another language. The move to Germany with a family makes the most sense if its permanent. It would even be a good idea if it was permanent.
Also worth noting is that its actually very hard to leave Germany once you decide to in a few years. I have failed to leave the country and yet am single with no children.