There is growing congestion but yes the situation on the whole is not too bad but through all the major investments across the area, the increasing tourism, increasing business visitors, increasing wealth (allowing for more consumption) the need for transportation will rise.

There is only fixed space for motorists which is not easily expanded. Also some buses are not that full, I agree but when you increase public transport provision you also increase the connection possibilities, ease and convinience, so has an added growth of users i.e. would help fill not empty the buses.

If people were charged, then those buses would be filled more anyway, leading to less congestion from the cars taken off, speeding up journeys for the rest of the car journeys.