They'll win over 60, but with so many games against Sac, Spurs, Dallas, Twolves compared to the teams the Bulls had to face when they went 72-10 it will be a tough ask to get to 70.
And no doubt there will be injuries..... (not to the Mailman though - they should get him in the terminator movies instead of Arnie. He's a machine...)
Knowing Phil and his zen philosophies, the number of wins will be immaterial. As long as the team gets homecourt advantage in the first couple of rounds he will be confident that they can go all the way.
I reckon 60-65 wins is realistic. Probably will still secure homecourt all the way through the playoffs, but 70+ is just being silly.