I have not used the Department of Commerce DNS root for several years. And I have been using an extended suite of TLDs for that time.
I believe that ICANN/Dept o' Commerce are but one root system operator among root system operators. ICANN/DoC are simply one among many and are entitled to no intrinsic superior position.
As for cooperating root systems - it's a nice idea, but since every kid with a Linux or Bsd box can set up a root without asking anybody's permission, its more a dream than a reality that one can rely upon.
Consequently, I prefer to recognize right up front that multiple root systems can exist with not only different contents but even identically named TLDs that are different.
I leave it to the users (and their agents, i.e their ISP's or corporate DNS administrators) to use a root system that gives the kind of results that they expect.
There are many people who today publish phone books - those that don't have accurate numbers end up in the trash heap pretty quickly. The same kind of user choice will determine which root systems are use and which are rjected.