The obvious comparison must be with football shirts. I think it was in the 1980s that the trend for replica football shirts started (and why are they shirts in football and rugby but jerseys in cycling?). I don't think that started more people playing grassroots football but it did lead to a boom for the top clubs and a geographical spread of football watching, with people now wearing the shirts of top English, Spanish, etc, teams in countries with no general football tradition. I can't see cycling teams benefitting in the same way as they don't have any real identity beyond their leading riders, but I can see it being good for global TV rights.