Oh, I know.
At the very least it presents an appearance of impropriety that public officials should avoid.
Most public officials, probably. The president, not necessarily. There's a reason the president and vice-president are explicitly exempted from federal conflict of interest laws.
At worst, it may stand a full-blown conflict of interest that opens the door to an abuse of the power and office the American people vested in Trump, to serve them, not to serve himself.
And as soon as the American people see him beginning to abuse his power to serve himself instead of the American people, such as he begins doing things with his businesses that are not business as usual, even his base will let him know he's crossing a line.
Regarding the people who voted to elect Trump, more voted for Hillary. They too were aware of Trumps business interests and they voted against him, for that very reason, in many cases.
It's really time to let that whole "But Hillary won the popular vote!" thing go. I mean, more people have watched Taylor Swift's "Shake It Off" video than there are people in India and China combined, and both of those things have exactly the same relevance to the Electoral College. As for why people voted against Trump and for Hillary, Trump owning businesses didn't even make the Top 10. First on the list is "He's Not Hillary."
People who didn't vote for Trump did so because Trump is a misogynist, a bigot, a racist, a clown, antisemetic, a White Nationalist, called all women (Rosie) a fat pig, called all other women (Hillary) nasty, made fun of a handicapped reporter, is a serial kitten grabber, colluded with Russia, is a Putin puppet, discussed Megyn Kelly's menstrual cycle in mixed company, is anti immigrant, and is far too orange for most.
The people who have filed law suits about Trump's conflicts of interest also care.
Buttburt liberal social justice warriors, all. They don't really care about any conflicts of interest, all they care about is getting him out of office.