If the 3000 cards number is correct, then no. There are only about 2200 registered players, and the vast majority don't have cards registered in their name.
I'm signed up. Only at about 1,000.
Hoping there are cards left when I get there on the 5th. Really want to do some in park hunting!
Oh, and I'm a Mighty Morphan Horror Ranger, by the way.
We only saw a VERY small sample of each of the hordes yesterday, from what was said in interviews.
All the hordes will have many, many different costumes making them up.
From TJ Mannarino in the Behind the Thrills interview:
"In a few days you should see something that will bring you to a unique aspect of story or interaction."