Is this discussion any different than the one we had a couple decades ago when credit/debit cards went from occasional use to primary currency? There was
huge outcry about how everyone would be tracked, how every purchase you made could be aggregated and monitored and tracked and sold and leveraged, how personal problems could arise when a spouse or lawyer saw inappropriate purchases on bank card records, etc etc. Today, we still acknowledge those problems - while using those cards, having just given in to the sheer convenience of its regardless of the data mining that occurs.
I still think the killer app for Google Glass type products is face & license-plate recognition, aggregating data and pulling it up for you a la augmented reality all the time. The devices & services would be cheap unto free by companies accumulating that data.