This is good in theory but for some reason I have a feeling it will look so different from the regular grass, the shine from artificial turf will look stupid
While you'll probably be able to notice a difference, it won't be a "glaring" one. The catcher's box for the bullpens is already artificial turf, and doesn't have any kind of weird shine.
Btw, the area that's being talked about to be replaced can only be from bullpen to bullpen. It's not that big of a deal, except I might bust my arse running out there with a drag on a rainy day.