This is as beatable as Duke has been in years...
"Beatable" is relative. Duke has an 85% winning percentage at home under Coach K, and they virtually never lose to non-conference foes.
I believe their non-conference winning streak at home is now at 76 games straight, the longest such streak in the country. The last time they lost at home to a non-conference team was February 26, 2000 to St. John's, well more than 10 years ago..