You're leaving out the spike that comes every holiday. Last year both consoles sold around 3.5 million over November and December alone:
http://vgchartz.com/hwtable.php?cons[]=PS3&cons[]=X360®[]=Total&start=39390&end=39453
Assuming the ps3 continues to outsell the 360 by a similar percentage over the coming holiday as it has over the beginning of the year, then the ps3 could shave off almost a million of the 360's lead over this November and December alone.
And then there's the '09 Holiday season to think about as well...
I still believe that the ps3 will pass up the 360 in total consoles sold by the end of 2009.







