When anyone says a future draft will suck, they are pretty much solely talking about the projections of the top guys. It really has nothing to do with depth. I think it's pretty impossible to project the depth of a draft past the lottery until you get later into a college season. It's not like last year many would have projected guys like Melvin Frazier, Kevin Huerter, Zhaire Smith, Shai G-A, Elie Okobo, etc to become first round prospects.
If the top 10 guys suck next year relative to the top 10 this year, then that really has no affect on the potential depth. The top 10 guys still go top 10.