It would be fun to see how shield bash would affect playing as 1h shielder. As a shielder with a short range weapon it can sometimes be very frustrating to fight 2h heroes. Its hard to control the range, and when you do hug them they can still swing in any direction and do a shitload of damage (o_O wheres the logic in that btw ?). So some other offensive option would be appreciated. Dont think its gonna have much impact on the other melee classes, since i imagine a nudge would work similarly to kicks.
In conclusion - im all for it, but then again i mostly play as a shielder, so my opinion is not unbiased.