No, Trump will not collapse. His supporters will not take any notice of the accusations against him. It's all fake news according to them. You should also remember that allegations without any proof are meaningless. Political analysts in both the USA and Australia have predicted that sexual harassment claims against Trump will have zero effect.
Like the woman who claimed Trump assaulted her on a plane: no evidence, no details. What airline was it? What date was it? What was the flight point of origin and destination? Seat number? What was the date of the fight?
What was the weather like? What about other witnesses? Of course, they can never answer any of these questions.
It's not just Trump. Now men are guilty until proven innocent. The Australian actor and Hollywood A-lister Geoffrey Rush is currently suing a Sydney newspaper for defamation over unsubstantiated claims of harassment against women. Women should be careful from now on about making up bullshit stories about men and also other women. They will retaliate. Rebel Wilson was also recently awarded several millions dollars in damages after being defamed by a Sydney gossip magazine. The courts are taking this stuff seriously. Wilson was only expected to get 250-300,000 AUD. A couple of million sends a message to the media: don't make shit up about public figures.
Saying "Trump assaulted me" is not evidence. A man staring at a woman is not rape or assault. A man refusing to give a woman a job is not "harassment" either.