There is almost always a little bit of turnover each year when it comes to the playoffs as teams in the Draft Lottery look to improve, while teams in the playoff picture have to make decisions on whether to push for more mediocre playoff runs or change things up and start the rebuilding process.
It is never easy to make those kinds of decisions, but every team does so in order to get to where they need to be. That is the ugly side of the coin. However, when the decision is made correctly, you can turn into a team that is on the verge of relevance again, thanks to rebuilding around new, young talent.