Memorial attendance has always fluctuated depending on what day of the week it is celebrated.
True, but despite fluctuations the trend until recent years has been overwhelmingly one of increased memorial attendances year-by-year. In other words, fluctuations were primarily about the size of the annual increase in attendance rather than one of increases one year followed by decreases the next and so on.
Of course, time will tell (as it always does!) whether the decrease in US memorial attendances this year (2013) compared with 2010 and 2011 is a one-off.