If the exit poll is accurate, then the overwhelming focus of the political parties will not be Brexit, the economy, terrorism or anything else to do with governing the country: their overriding concern will be the next (likely early) election.
For the Conservatives, that means the most important thing will be to choose a new leader who can win the next election. It will not matter what wing of the party they come from, or whether they were pro Brexit or anti Brexit, or whether they want a hard or soft Brexit; all that will matter to the Conservative MPs is whether the new leader can win the election. So even though many of them believe he put naked self interest above the best interest of the country when he came out in support of Brexit, they will elect Boris Johnson as their new leader, because they think his charisma and political star/celebrity quality will help them win.