Demographics as destiny or as a signpost for new pathways kept Carson City’s Board of Supervisors and top staffers batting about ideas for change Thursday.But so did shorter-term issues: downtown business and traffic; grappling with sewer rate fee hikes; and deciding whether the community needs a deputy city manager. Yet the all-encompassing talk at a six-hour strategic planning workshop, which followed a brief presentation on city demographic age and housing patterns, seemed seamless at times.The status quo took a beating after participants heard the city’s population of people 65 or older is 2 percent higher than the state’s and nation’s …