In Japan new cars can only be purchased in some cities when the owner has an off street parking place for it. In order to compete with the private car, transit systems have to be time competitive as well as attractive to use. The experiments with different classes of bus systems in Bangkok is a step in this direction but will not be successful until buses can be given preference on crowded city streets. If bus traffic can move faster than private cars then that is a good advertisement for their use. There is a fundamental economic truth here.
Buses are expensive and are unproductive if trapped in traffic.
The quality of service can be increased either by putting more under-utilized vehicles on the road or measures could be taken to make the existing fleet more productive. For example by allowing the buses to move faster and thus carry more passengers in a given time period. Other innovative traffic management measures can be introduced to improve traffic flows. These include variable direction traffic lanes, and reservation of streets to certain classes of traffic. Streets reserved for only bus traffic is one option, streets reserved for NEV as in Shanghai is another.