I don't think that's necessarily true. CSX (?) had the transcon East of NOL fixed to top notch condition within two years after it was destroyed. Obviously the Freight thought very highly of the line. The decision to indefinitely suspend the SSL was and is 100% Amtrak's.
The other big difference between the EB situation and the SSL East situation is that political support for the SSL East in the area that it runs through is luke warm at best, whereas the politicians at every level in ND are willing to go to bat for the EB.
Also, the CSX route while restored, is hardly a top notch route before or after the storm, in terms of overall importance in the network and load carried goes.