I'd only do the Rondo/Howard deal, if it's Rondo plus picks, for Howard.
Otherwise, it would be like what happened in the 90s, when Houston traded all their glue players for Charles Barkley and then, had a team with one aging shooting guard (with worn out legs) Drexler, an aging frontline of Olajuwon & Barkley, and zero bench. It was pretty clear that the Rockets would never see a title afterwards.
For the Cs, losing Rondo alone, would be worth it, as all the glue players would stick around, and form a system to support Pierce/KG, with Howard in the middle for defense and rebounding. And that's fine, a 8-10 ppg, 8-10 rpg, 0 assists, perhaps a shot block or two big man in the middle. I can live with that.