Looking at the 665 item lvl for Survival, Simcraft is stating 1584 Multistrike stats from gear. I'm currently 664 item lvl and have been trying to optimize multistrike over anything else and I'm still only at 800 multistrike from gear/enchants/gems. Seems like everything has a ton of crit on it, but harder to find multistrike.
People are going to look at Simcraft and be like "OMG NERF SURVIVAL" but there is no way in hell to get that much multistrike from gear right now.