Earlier quoted context omitted.
Those aren't mutually exclusive: tolls are a way to force a lot of people to economize at once, which can create the critical mass needed for a functioning bus ecosystem, which could even include private buses.
Yes, tolls make only sense when there is an alternative to driving. When people have no other choice than to drive nothing will change with tolls. Tolls are basically an artificial added cost to driving. However ideally the public transport system should be designed in such a superior way that people would switch without artificial punishment for driving.
Roads are enormously expensive both for construction and maintenance, and in most places AFAIK fuel taxes and vehicle registrations do not cover that cost, so they are being subsidised by the general taxpayer.