Many players are saying that they won't wear it until it doesn't look so noticeable, but they like where they are going with protection. There creators of the cap noted that many sport equipment has evolved greatly over the years, and it's only a matter of time before this protective hat become the new norm. This blog has a nice overview of baseball equipments evolution- http://www.pitchershelmet.com/evolution-of-athletic-gear/ Not sure how long it'll take the mlb, but it doesn't seem like it would interfere with play, so why not?? My younger sister's softball league makes head/face protection mandatory. As of now I'm not sure if little league baseball is the same way, but I'm sure it will soon be switching over to have the same rules.