Rush wanted to leave last year, and pretty much every
KU fan considers him gone. I don't know if Chalmers' draft position is going to get upgraded that much - he's a 6'1" combo guard. After making that huge shot this might be his best chance at the league and he and Rush are best buddies and will probably declare together.
IMO, you're looking at them losing all the seniors plus Arthur, Rush, and Chalmers. I honestly think it's a no brainer. This isn't Florida the last two years, that doesn't happen often.
As for how good they will be next year, I think they'll win the league next year again easily unless Augustine comes back. The whole Big 12 will be down and the Big 12 North will still be really down. They bring in Little and Appleton, the Morris Twins, Releford, and Thomas who will help rebounding.
They return Aldrich, and Collins which is as good of a 1-2 punch in the league next year, and they have other talented Kids on the roster (Reed, Teahan). Can all the incoming talent gel in time for the season? I don't know, but I still think they'll be the favorite next year.