Ah, I missed that artefact that makes the Crimson Sorcerer a Daemon. That is indeed freakin' awesome.
But the flying Circus doesn't have to come down to fight. It can summon other Daemons to fight and score objectives and get linebreaker. It takes an assload of shooting to down just one these days. They will have more trouble accomplishing Maelstrom missions perhaps, but in regular games they are tougher than ever. Even in 6th, the most effective FMC lists weren't the ones that tried to get up in there and assault right away; it was the ones roaming around using powers.