The line "If you have a phone in your pocket, why wear this? And it doesn’t seem to replace the need to carry a phone." applies to both Glass and smart watches equally.
Both are wearable screens augmenting your phone, though the Glass has additional features, like voice commands and a camera
"If you have a phone in your pocket, why wear this? And it doesn’t seem to replace the need to carry a phone." is not a valid argument against google glass is what he is implying. The same can be said about pebble.
Both are wearable screens augmenting your phone, though the Glass has additional features, like voice commands and a camera