They cite that their employees get 200+ emails a day. Yet they want them to revert to a chat based system. They'll still get the same amount of communication

They cite that their employees get 200+ emails a day. Yet they want them to revert to a chat based system. They'll still get the same amount of communication but be expected to give an immediate response. How long will it be before people just mark themselves as "Away" and treat their IM's as a new mailbox.