I would say there is a chance to see one here or there, but it's doubtful. It's not like hitting, swinging a bat switch is a whole lot easier than throwing swtich. But...there is more interest into this subject so we'll see if there is a chance of a few of these pitchers in the future. It'd be a good weapon, you could really increase your pitch count.
Not sure there is a possibility but it's pretty doubtful that it will become the norm.