I Wish My Company Didn't Have So Many Opportunities

I am happy to work here at Zurich, but I have noticed a problem. An odd problem to be sure. And to many, not a problem at all. We have lots of opportunites within the company. People can move to positions inside the company to work on new things, make more money, or move to a different part of the country (or the world). But this has come back to nip me in the hiney - my Team Manager has just accepted a move that is upward and over - out of our group/department. Darn it! We develop some very skilled people - and they move out (and up). I suppose it is selfish of me to want my boss to stick around because I enjoy working for her... darn all this upward mobility anyway!