Quo vadis?

Whither now for UKIP?  Farage stood down claiming, effectively, that his work was done following the referendum vote to leave the EU, but the party seemingly soldiers on, and are due to elect a new leader.  But for what purpose?  Other than a watching brief to be ready to hold the government to account over its conduct of the Brexit negotiations, it seems to have little point.  And once we actually leave....??