Khan’s gonna walk re-election. The hate he gets is almost exclusively from mouth-breathers who don’t live in or even visit London, and believe all the crap about gangs of Muslim communists stabbing anyone who dares go out after dark while the mayor sits in City Hall cackling and cheering them on.
In reality, Khan’s been a fairly mediocre mayor, although he’s been hamstrung by how few powers the office holds - can’t be as ambitious as Ken on transport thanks to austerity, and can’t fix the biggest problem (housing) without central government getting out of his way, which won’t happen while the Tories are in. He’s still popular personally, though, and the fact that Bailey was allowed to be the blue candidate this time is a sign of how they’ve already accepted defeat - he’s kind of a crank, who only got the nomination because anyone with any actual brains knew running would be a lost cause (at least this time around).