Andrew Scheer represents no threat whatsoever to Justin Trudeau and the Federal Liberals. 
Scheer's so-called accomplishments amount to nothing, he had just about zero visibility on the national stage,until his friendly rapport with alt-right media The Rebel was pointed out recently, he has put forth not a single policy idea of any kind, and the majority of Canadians, who approve of the progressive social agenda of Trudeau and the Liberal Party, are deeply suspicious of Scheer's ties to social conservatives and their outmoded, fundamentalist Christian agenda. 

In Ontario and in Alberta, despite the dislike that many have for Kathleen Wynne and for Rachel Notley, the Conservatives still face an uphill battle. Patrick Brown is just as much a non-entity as Scheer, and his association with social conservatives continues to dog him in Ontario. In Alberta, many people will not forget the crony capitalism of the Conservatives and their economic mismanagement of the province for decades.