I bet scoring goes up. When batters can actually know what the strike zone is before the game starts they’ll have better judgement on what needs to be swung at.
It will probably even out eventually as players get used to it come up from the pipeline and current players adjust. In my opinion no way does offense go up—the zone is going to expand because they haven’t called the high strike for ever. The current pros are all used to that small zone. And a ball that just kisses the black is going to be called a strike 100% of the time now.
Freegards