Doesn't President Obama hold the record with four chiefs of staff in his first term? The point is, this is not new.
When outsiders, like President Obama and now President Trump go into the office of president, there is a huge gap in their knowledge of the bureaucratic system and the key people who run this huge operation. This is not the same as a system player becoming president who has gone through the learning curve for decades; Hillary.
For the outsider president, his first chief of staff needs to be someone who knows the rules, quirks and key players in a bloated system. Unfortunately, the best tour guides will often be a part of the very system, which may need fixing, before you can do your agenda. Ther will come a time where change will need to occur.
Once the president gets his feet wet and learns where the bottlenecks are, what needs to change, who are your friends and who are your enemies, they may need to change the players at the top, to meet the needs of the new strategy. Trump learned that the swamp is not just Democrats, but also many establishment Republicans, who have become millionaires on a civil servant salary. They do not want change. He needed a new chief of staff, who was loyal to him, and to the America people, instead of to a political party or to lobbyists who represent golden cows. Priebus helped Trump wade through the swamp and now Trump knows the terrain and where the fish and gators are. Next time, he will come back with a backhoe, nets, and dynamite.
Priebus was like the rabbit runner in the mile run. His job is to get out in front and force the pace so the key runners get a better time. The rabbit does not finish the race, but gets about half way and then gets out of the way. Priebus did a good job and is not upset that he had to leave the race, since he knew he was the rabbit leading the swamp mile. The pace was real good, so Trump is happy with him, and he feels he did his job well.
Priebus is also happy since he is going to be buffered from the fall fireworks. This maximizes his future options, no matter where the coins falls. The fall fireworks will be connected to a look down memory lane, about the DNC nomination manipulation, the attorney general office under President Obama ignoring crimes, as well as the Hillary server and the Clinton fountain, who combined are now running the silent coop. This is the main gator pit. Priebus does not have to get muddy, so he is happy.
In nature, a swamp serves a purpose. It provides a place for all the extra water during storms like hurricanes. This swamp has dams and is filled with self serving cut throats who attempt to maintain power ay any cost to others. The swamp will never fully go away since it provides a way to maintain a continuity of power during severe storms. Rather, Trump will drain the swamp to a moderate level so it can absorb a larger storm. The draining action will cause the cut throats to turn on each other, reducing their numbers to a more manageable number. The main den of gators will be disturbed and they will look for fall guys, with the bigger the better. The fall guys will seek their own survival in the shrinking swamp; gator barbecue.