Not really an eternity. Trump has been leading for 4 months.
His level of support is very stable. It’s hard to think of anything that can happen between now and February that will change things.
The more he hangs on the more people will continue to go to his side. In time he will overcome the seriousness factor. I think some people are having a hard time taking him seriously. Many people thought that he was doing this for a publicity stunt.