If I am running an org, I would much rather have another squirt/peewee team full of 15 players then a half season 18A team that would do noting but cause issues for 75% of the season.
If I'm running an organization I would want has many teams at all levels as I could. I would want them all to play for something other than the occasional tournament championship and league championship. I'd want them to have the chance to play at districts because winning your league is nice but winning districts says I'm the best of the best in the district.
Ever since my oldest started playing at squirt and every year after that we have had players that are just looking to hit someone, even at AA. You don't think at 16U the players don't know already if they will make the 18U team or not. They absolutely do and they just go and cause problems because they know it is their last year.
I think this was a bad decision by the AAHA. I think the leagues and clubs can work together to figure something out for next year, I think this year is lost for 18A districts. I like some of the fine ideas that others had suggested. Would it stop the stupid stuff all together? Probably not but it will help, especially if coaches and organizations are held accountable.