UPDATE April 2022. I’m leaving this up, although it’s obviously a bit embarrassing (and wrong – Johnson ultimately served two terms as Mayor).
1. The Mayor doesn’t have much to do anyway. He may have an £11B budget but it’s really only half a job. New Labour deliberately hobbled the Mayor’s office from the beginning by retaining control of everything important at the centre and providing no direct tax raising powers. The remarkable thing about Ken’s tenure has been how much impact he’s been able to have with control of public transport and bugger-all else.
2. He’s funny. He is funny isn’t he?
3. He’ll be a one-term Mayor. Nothing he’s proposed is achievable within budget. He’s backing away from the Routemaster idea (which has been authoritatively rubbished). Central Office cagily supported Boris but not his policies. With all the big reforms already firmly entrenched Boris will struggle to make an impact. As budgets rocket and policies evaporate disillusionment will set in.
4. Cameron will cut him loose. He may be better behaved now but you can’t innoculate a boob like Boris against gaffes. Can it be long before he alienates bus drivers or pensioners or people who live in Penge?
5. He’ll get bored. Boris evidently has the attention span of a nine year-old boy. As his concentration lapses he’ll drift off. Pretty soon he’ll forget where he works and after a year or two Londoners will be able to pick someone else.