This is a bit of an overreaction. I haven't been a big fan of Maher's form of intellectualism for a long time (Religulous was intellectually dishonest, his view on vaccines is dumb, etc. - he often makes "free thinkers" look bad), but the mere fact that he had Milo on isn't good enough reason to tank him, and neither is his perceived lack of liberalism.
Watching the panel in addition to the interview, Milo didn't look good. Neither did Maher, and I have no idea what Maher was thinking with his impotent approach, but Milo did a great job all on his own showing the audience what a terrible person he is. Being transgender is a form of mental illness, the former intelligence officer on the panel has a low IQ, and all the other things he said. . .Larry Wilmore made the point that a lot of his argumentation was analogous with what was said about homosexuals and blacks, and that is true in another form: it is the same argumentation that has lost again and again, even with the biggest platforms possible.
In the end, Milo came and went. But then so did those videos, and now here we are.