There you go. Much like holding, which can be called on every single play, it will be called when blatant. Bo Jackson's run was clean because he led with his shoulder pad and "hairline" into the defender.
Probably get 2 or 3 calls per game, that's my guess.
id bet more like 2-3 a week...
they refs are going to be super discretionary about it due to the ridiculous "ZOMG THE NFL IS ENDING" reaction.