During a Wednesday debate on proposed changes to San Antonio’s charter, three City Council members argued that the low pay for their positions all but ensures only the rich can hold office here. The comments came as council weighed possible amendments to the city charter that would abolish the pay cap for city managers, increase council members’ terms of service and raise the pay for the city’s elected officials. Currently, council members earn a meager $45,722 a year — less than the U.S. median annual salary.