First, this season MLB baseball is not allowing batters to step out of the batter's box unless they offered at the previous pitch and there is already rules on the book for the amount of time a pitcher can have to throw a pitch (it's never enforced, but it is there). All of these 'ideas' on how to speed up the game by altering the rules when the real solution was given on April 29th of this year.
Baseball games take 3 hours due to commercial breaks and the between innings 'in stadium fan participation' crap. When the White Sox and Orioles played in an empty stadium, the game took 2 hours and 3 minutes.
I dislike NASCAR. I think it is both stupid and as boring as watching paint dry. I do not think that the powers that be in NASCAR should fundamentally alter the sport so that it begins to appeal to me.