It would not be surprising at all. I mean, they managed 40 wins just last season amidst the bumpy DeMar DeRozan experiment, the Mike Brown firing, the De'Aaron Fox trade demand, the mid-season integration of Zach LaVine, and the general feeling of malaise surrounding the state of the franchise.
The issue isn't that the roster as constructed can't finish with a .500 or better record; they very easily could. The issue is whether or not they have any kind of ceiling beyond the 9th/10th seed out west. Most would say that they don't, and that it's not worth investing in any kind of "win now" approach as a result.
Should no other major off-season moves be made, I could see this roster finishing with anywhere from 38-45 wins, which again, only realistically keeps them in the hunt for a bottom-tier play-in seed. You need somewhere in the vicinity of 48 wins just to finish 8th in the Western Conference.