I vaguely remember a few teams in the past losing most of the preseason (maybe it was the Spurs) then doing great once the season started (and the other way round). I think with older teams, the vets hold back and just use it to get back in the swing of things. Also Nash is a notoriously slow starter who usually plays poorly in the preseason.
I think it will take months to gel (if it was us, people here would be yelling it's an excuse!), but also the Lakers you see in the regular season will look much better than the ones you saw in the preseason.