Well, I disagree that's all they have.
They have Dame that they hope will go back to superstar status once he is healthy, they have Simons that they believe in and the trade gave him more on court time, they have Nas that they believe in (again, the Roco trade in theory opened some time there), they seem to believe they can resign Nurk which has a positive value (even if it is not as high as some here believe).
I believe that the Blazers have a depreciating asset (Dame's prime) and that moving quickly to rebuild around him with the other assets they have (Simons, Nas, Supposedly Nurk) before it is not worth doing it. That's what they might have lost if they tried to extract every penny from every less critical asset they have.
I still think that the analogy I made makes a lot of sense - but it's ok if we disagree on this.