I actually think trading for Ben Simmons is a great package for a team that's trying to blow it up. Yes, he could be completely out of the league after this contract but you need a big salary to trade away your star, like Beal, and hit the reset button. The Nets also have a surplus of picks to dish out and their owner wants to compete now, not rebuild.
I don't actually think this is a good trade for the Nets, but this is something they could consider if they wanted to get rid of Ben Simmons and compete for a playoff spot.