"I like the fact that in wow i can sign up for a raid on the weekend and have immediate access to it, no muss no fuss."

2 things:
1. You can still raid on your own schedule via WAR's public quest system.
2. When a faction's capitol is ransacked, the raid instances are open to you for like a week, so it is quite flexible when you raid.

"If they impliment it the way they are talking here its going to drive away alot of the older crowd."

You can still raid, but you can't farm the same raid boss repeatedly ad nauseum. This will not have much of an impact considering most people hate playing the same shit for the 50th time in a row.