Re: Monitoring players
I agree that this could be a great tool for monitoring pitchers. But it seems like something that would be embraced more readily by the NFL or NBA, since those sports are more of a test of endurance.
A bigger stumbling block for MLB embracing this would be that the only other piece of technology that compares to this in daily use for games is the radar gun. - and the radar gun is not on the field of play. I think the traditionalists in MLB would be very reluctant to bring a piece of technology onto the field.