That's not really where I was going with it. The insta-cast evac AAs have a longish recast time. That can be reduced with AAs, but there's still a recast time. If you allow Teleport to Bind to be insta-cast, you now have two spells that can instantly save the group. Now add in any port spell. Wizards and druids would have unlimited insta-cast port spells. I don't see that happening.