Except for all those poor people that are still in the bus when it teleports :P

if teleportation is impractical you could just use a faster bus, like USB 3.0 or more lanes like PCIe

everybody gets on/off at the same time instead of one by one (every seat has it's own door?)

On old British rail trains, commuter trains had many doors, I think on each side there was a door for each pair of row of seats?

There was also no door lock, so people could start leaving the train before it fully stopped.

The lack of a door lock is also why they're not used anymore.