Youcan skip cat6 and go straight to fiber but it would be very expensive. Usually budgets determine users choices, today optical fiber with optical transceivers needed for residential equipment is about twice as expensive as an similar system using Cat6 and associated copper electronics. Installation of copper cabling is more craft-friendly and can be accomplished with simple tools and techniques. Additionally, copper cabling supports the data terminal equipment (DTE) power standard developed by IEEE(802.3af). Moving to fiber would mean buying a fiber-based network card to replace equipment already included in a typical homeowners PC.