I think that Dallas wants stars not role players. All of these trades don't move the needle. Midseason trades create their own problems. New players take time to integrate. People are proposing all of these trades but none of the players coming in are stars except maybe Collins and Wiseman. As far as Porzingis you need to be really careful here, remember Steve Nash age 26? He had injury issues too. Drummond would be a great fit here if bought out though he would probably end up on the Lakers.
Nash:
age 24: 40 games
age 25 : 56 games played
age 26: 70 games
Porzingis:
age 21: 66 games
age 24: 57 games
age 25: 20 games so far but will be much closer to like 65
Nash:
age 24: 40 games
age 25 : 56 games played
age 26: 70 games
Porzingis:
age 21: 66 games
age 24: 57 games
age 25: 20 games so far but will be much closer to like 65