The truth is that people are reacting to the ‘positive’, and very much contrived, news about the signups.
This is probably the high point for the year. Wait until the other stuff starts kicking in. Like people finding out about their 2015 premiums right before the election.
I also have to believe that it is still early enough in the year, that many people have not yet realized that they cannot see their former doctors, and have yet to find out what their new co-pays and deductibles will mean to their out of pocket costs.