You seem to be scoffing about something that has been common custom... even Barack Obama. I don’t get the applicability here, if Trump does the same thing.
Of course when it comes to pecuniary view, one could say Trump would gain even from a “rising tide lifts all boats” philosophy. And that might not be the worst incentive in the world to manage the economy wisely. He knows what the system looks like to the great economic business engines of America.
First, you said something to the effect of he "must" relinquish control. That is false.
Second, you said that control would pass to a trust. When disassociation is desired, only a "blind trust" does the job. Other sorts of trusts do not. The CRS piece makes the point in a more comprehensive form, but essentially, he has to "lose interest" in his current holdings.