They're a good team. They're also a big threat to make a win-now move at some point. I'm surprised that they haven't at least been mentioned for Milsap/Melo/Ibaka.
What on earth are they going to offer? They don't have particularly valuable draft picks, and they have no expiring contracts of value besides Porter, which at best would be a lateral move if traded.
Mahinmi is owed $48 million over the next three years and has played only one game this season.
Nicholson is owed $20 million over the next three seasons and has played in only 23 games and averaged 8 minutes, despite being healthy.
Markieff Morris is an inefficient chucker (.488 eFG on 12 shots per game) who sometimes rebounds. His contract isn't terrible ($16.6 million combined the next two seasons), but he's also got some very questionable character baggage to go with his mediocre production. He's clearly the starter they need to upgrade, but is he going to make his new team remotely better? No.
To get either Milsap or Anthony (who'd have to want to go to Washington) they'd have to trade two of the above players. That'd make no sense for either New York or Atlanta.
Would Morris, filler, and a later 1st make sense for Orlando to trade Ibaka? I personally don't think so. Doesn't make them any better next year than they are today.