I definitely do not see any sort of ground swell of belief that next year's team is going to be worse, never mind automatically going to be worse.
Nor, in the case where the matter is discussed and someone is of the opinion that next year's team may/will not be better than last year's, do I believe that it is entirely centered around the loss of graduating players.
Was Davis better a year ago than he was the year before? Did he improve...at all? What about Stephens? The only thing that saved Purdue last year in light of what happened with those two was the arrival of Swanigan, and Cline being able to provide depth behind Mathias.
Players are supposed to get better...but that has not always been the case at Purdue during Painter's time...teams are supposed to get better in theory as well as they become older and experienced...that has not happened either due to the turnover (which in part is directly related to the failure to improve as individuals).
Some legitimate reasons to suggest that next year's team may not be better...they lost their leader, on the floor as well as off of it, and nobody returning has shown the ability to remotely lead as he did (that does not mean that it won't happen, but it is a valid concern)...they lost their best player, and their best player at both ends of the floor for that matter...Swanigan was nowhere near as effective when paired with Haas as he was when paired with Hammons...there was no concern about foul trouble at the center position because of having Hammons and Haas, and that luxury no longer exists (never mind that Haas was more prone to fouls than Hammons)...the luxury of replacing one dominant 7-foot post player with a fresh 7-foot dominant post player no longer exists...same questions persist at PG that did before (although hopefully there may be a better answer or better answers next year with the addition of Albrecht and Edwards)...with guys that have not been very adept individually on the defensive end, how does this team get stops, never mind get stops when they have to get stops?...Hammons was able to erase mistakes that were made defensively on the perimeter, and Purdue does not have that any longer...finally, and most important in my mind at least, last year's team had many of the same troubles and issues for the course of the season a year ago, and it is what did them in in the games that mattered most, as well as THE game that mattered the most...if those things were never resolved (and especially so in that some of them were known going into last season), then what is there to suggest that the same thing will not happen next year?