^^ With concrete statements such as "numbers have been down the past few days", "a lot", and "not just today", who wouldn't take your word for it?
To clarify, MTT traffic on Merge in $4k GTD's or better was actually up a bit this Saturday (5/10) from last Saturday. Mon-Fri traffic in the same types of MTT's was down this past week about 1,500 players (better stated, "entries"). The Sunday majors are down today as well a fair bit from last Sunday, but so is Bovada and WPN.
Both Bovada and WPN have had increasing rate of overlays lately too. I know because I track them and can provide actual statistics on the subject. Trends for this time of year coupled with the holiday today are the top two reasons, in my decently expert opinion, as to why traffic is off. Welcome to the summer time, folks.