Instead of governments announcing bans (I believe france announced a future ban a couple months back), I would rather see these governments committing to only purchasing electric vehicles for all government fleets. Why not put your money were your mouth is and help pump money into the industry via purchasing orders, rather then simply announcing a ban?
Because this does exactly that, and more. The gov have effectively committed to buying only elecrtic fleets because thats all that will be sold.
On the other hand, the current government could easily announce that starting in 2020 all new government fleet purchases are required to be electric and it would help create a lot of new competition to bid for those orders.