Tanking is not the right way to do this, just draft and develop better like Tampa Bay.
Notice how Tampa's roster has players who were picked numbers 1, 2 and 4 overall all of whom are under 25. And they sold high on an aging player for two first round picks, albeit he forced their hand, and not everyone has a player that can fetch that kind of return.
Again, we're not talking about getting rid of everyone. Just players that are likely not going to be here after this year, when there's a legitimate shot at a generational talent. If the foundation of a good team is already in place (debatable, but that seems to be your premise) then there's no downside to taking that approach.