These are Kenpom's projected odds of Duke dropping 13 in a row to finish the ACC schedule a disappointing 3-13.
No game is ever guaranteed in the ACC. That's why its one of the best conferences without fail. But I am feeling confident: Duke will win again this year, perhaps often!
That would depend on:
-The next 13 conference games
-ACC Tourney
-Seeding
-Matchups
-Upsets in the bracket
-And most importantly... Whether or not Kenpom's projections are in any way reliable
Short answer: I'm not sure, it doesn't say, but probably ~10%. Thats not necessarily a bad thing.
10% seems awfully high at this point in my opinion. I'd guess (purely conjecture at this point) the champion is more than 50% likely to come from the quote-unquote big 4 (Kansas, Memphis, UCLA, UNC). That leaves less than 50% chance for the rest of the field, of which several teams might have a decent argument. But as you said, it's hard to say at this point.