said by DeathK:The ONT is likely already gigabit capable
The newer Calix ONTs could be used for Gigabit service but I'm not sure about the older ONTs such as the Alcatel 7342 family. Currently CB seem to be having issues figuring which ONT a customer has at the point of order so scheduling customer premises truck rolls is the norm. Perhaps that will change later.
In future I imagine that some customers should not need a visit - although their cross-connect location would still need a visit (unknown to the customer).
The process seems to have started at least...