The only good thing about political appointees, like Johnson, like Jarrett, is that when their boss leaves, they are expected to go too, right?
They serve at the pleasure of whatever politician appoints them and it’s expected that new presidents from opposing parties or opposing factions will appoint someone else.
It’s up to Obama or his donors to keep them employed if they are to continue in his service.
Technically, I think they're gone before the new president is inaugurated - unless asked to stay on. The assistant administrators and such (non-appointees) take over until a new boss is designated.
In this case, a pile of czars get to pack and GTFO, too.