Iger being the Democratic nominee in 2020 would be so unfathomably tone-deaf I'm not sure I can put it into words. Both parties are perceived as being in the pocket of big business, more interested in their own profits than the well-being of the working man. Republicans are doing a great job of proving that out on their side, but Democrats are (theoretically) trying to re-cultivate the image of being the working man's party. Nominating the CEO of one of the world's biggest and most powerful mega-corporations to be their presidential candidate while trying to make that case would be an act of stupefying idiocy that will likely cost them yet another election and give us 4 more years of the Fanta Menace as the left fragments even further.
Truthfully, I don't know Iger from Adam. He almost certainly won't be as flagrantly self-indulgent or flat-out stupid as Trump. He may even be a fairly moderate-minded person. But barring some crazy Obama-in-2004 barnburner speech between now and the presidential primaries where he declares healthcare to be a human right, supports raising the minimum wage to $15/hr, and insists on taking extensive immediate action on climate change, Iger would be yet another "least-worst" offering at a time when "least-worst" is the actual-worst thing Democrats could possibly field.