I agree and am very concerned about all of this. And I recognize the perspective of many who say he must hold onto power to avoid prosecution once he's out of office. However, as I have been using his history (well-documented over 30 years) as a guide to his behavior as President, let me also submit that Trump -- like many lazy, slovenly jack-off bullshit artists -- also has a history of giving up when it looks like he's going to fail. His many business misadventures suggest this.
He won't give up as in quit the race, but he may try to raise as much as he can from a political contribution perspective and then not spend it on politics, e.g. There are pretty hefty restrictions post-campaign (not that he'd abide by them), but he can transfer the money to pay his kids' salaries for services rendered to the campaign assuming they are real services and at "fair market" prices. We know that Trump valued his own "brand" at several billion when claiming what his assets are; I'd assume he'd do the same with his kids' contributions to the campaign and find some way to justify it. I've said it before -- he'll squeeze some sort of pecuniary victory out of his defeat if it happens.