I have commented on this point on AB before but nobody should underestimate Boris. He comes over as a buffoon, and reasonably likeable, much in the manner of the Uncle at the wedding that gets drunk and embarrasses everybody.
But beneath that smirking exterior lurks a very capable politician. You don't have to be Mystic Meg to predict that he will be the leader of the Tory party at some time in the future, probably sooner rather later. Whether he then becomes Prime Minister is up to the British electorate. The path to the door of Number Ten is strewn with the wreckage of the ambitions of Tory Party leaders.
Ian Duncan Smith, William Hague, Michael Howard, etc. Even Michael Heseltine nearly got in. He would have made it but the party made the puzzling choice of Major instead, something they regretted for nearly 20 years.
Ignore Boris at your peril !