It doesn't matter if the Trump kids don't what Hillary did. They shouldn't be in a position to do it. He should do as past presidents have done. He should put his assets into a blind trust and make the trustee someone who doesn't have a personal relationship with him. This isn't required by law, but most past Presidents have done it to avoid the appearance of conflicts of interest.
Hillary was specifically prohibited by law from engaging in matters deemed a conflict of interest.
As you stated, a blind trust is not required by law. The President and Vice President are exempted from conflict of interest laws that apply to appointed officers of the Executive Branch. There is a good reason for the exemption.
Although it may seem like the "honorable" thing to do, placing assets in a blind trust would, for the most part, be useless. Trump would know what assets are placed in the trust and, therefore, the trust would not be blind. Only assets acquired and sold after the establishment of the Trust would be unknown to the President.
Demanding a blind trust so that Trump's non-minor children could not participate in the management of those assets would, I am guessing, be unconstitutional with regards to those offspring.
The best, and only reasonable way to deal with this issue is to let Congress monitor the situation. If Trump makes specific decisions related to
particular Trump assets, the court of public opinion will make a ruling. Requiring Trump to sell his assets is not going to happen.
The obvious exception to this, I am guessing, will be that any companies owned by Trump will no longer be able to sign government contracts.