In-theater movie viewership in the US has declined every year for the past 50 years....you can't refute that. By saying Pirates 2 is the biggest opening in terms of dollars is not the same as saying it is the biggest opening in terms of tickets sold.
Actually that's very easily refuted:
http://www.boxofficemojo.com/yearly/
If you go to the Opening Weekend tab on that same link you'll see you'll see that Wrath of Khan won the opening weekend dirby with $14 mil in revenue, and if you devide that by the $2.94 average ticket price you'll get a total attendance of 4.8 million people. Now if you take the $55.5 mil reported for Friday for Pirates and devide that by the $6.40 projected for the current average ticket price you'll get a total attendance of 8.6 million people. So even on tickets Pirates is winning at least some of the historical battle. And really that makes sense, there are many more screens in theaters these days, than there were before and blockbusters wind up on many more screens than they used to. You often didn't get true "national" openings back in the old days, instead movies would cycle through the markets, smaller markets like Tucson where I live were frequently 1 or 2 weeks behind the large markets like LA and New York. Now with 20 screen cinemas replacing 4 screen cinemas there's more room for truly national openings and therefore more opportunity for people to watch the movie on opening weekend. Of course producing 4 times as many movies as they used to there's not enough room for staying power, it's all opening weekend or bust these days.
So far you're 0-fer, quit while you're behind.
Oops, in rewrite I accidentally deleted the part that directed you to the Total Attendance in Millions column on the link, that shows a generally upward trend from 1980 through 2002 with some tailing off lately. Though this year is doing well in the block buster market so the tailing off could end.