I really don't like these trade ideas where we trade PP for B-level type players (Josh Smith, Jefferson, Millsap etc). Those guys won't turn us into contender and it limits our cap flexibility going forward.
You need A-level type players to win in the NBA. Committing your cap space to a B-level type players is a road to nowhere.
If we trade Pierce and/or KG it should be for picks/young prospects. If we can't get that, we are better of staying with Rondo/Bradley/Pierce/Green/KG for one more year. That team is still playoff team in the east although it has second round exit ceiling.