Are Amusement Parks a Thing of the Past?

I am staying across the road from Six Flags Over Texas in Arlington and it made me wonder, are the days of the big amusement parks numbered? They use up a lot of land and it seems like people have access to so much else these days that they may not want to go out in the heat of the summer to stand in long lines to ride the rides. Plus the cost to get in is so expensive. They closed AstroWorld in Houston and it seems like most of the business that fed off Six Flags here have closed down. So it just made me think....