Riding with other people is _a_ problem, but I don't think it's the primary problem for why transit isn't used in the US.
Imo, the biggest problem is that of convenience. Convenience (time), cost, comfort, and (perceived) safety are the factors people use to make transportation mode choices.
If buses aren't prioritized in traffic above single occupant vehicles via dedicated bus lanes, signalling, etc. then they'll always be slower than a car because of the additional stops. Frequency is also a consideration that factors into timing, as well as transfers.
If any US city wants to get people onto transit, they need to prioritize transit above less efficient modes, amongst other things.
Imo, the biggest problem is that of convenience. Convenience (time), cost, comfort, and (perceived) safety are the factors people use to make transportation mode choices.
If buses aren't prioritized in traffic above single occupant vehicles via dedicated bus lanes, signalling, etc. then they'll always be slower than a car because of the additional stops. Frequency is also a consideration that factors into timing, as well as transfers.
If any US city wants to get people onto transit, they need to prioritize transit above less efficient modes, amongst other things.